New species can form in what type of evolution? a. Speciation . b. divergent evolution C. convergent evolution

The worst enzymatic failure among the options would be **argininosuccinase** deficiency.

Argininosuccinase deficiency, also known as **argininosuccinic aciduria**, is a rare autosomal recessive urea cycle disorder. This condition occurs when the enzyme argininosuccinase, which is responsible for breaking down the amino acid arginine, fails to function properly. As a result, high levels of arginine and its byproduct, argininosuccinic acid, build up in the body, leading to a variety of symptoms such as vomiting, poor growth, developmental delay, and even life-threatening complications. Early diagnosis and treatment are essential for managing this condition, and it is important to consult a medical professional for appropriate guidance.

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The invention and development of the microscope had a profound impact on human understanding of life.

Here are some key ways in which the microscope changed our understanding:

Discovery of Microorganisms: The microscope revealed a previously unseen world of microorganisms, such as bacteria, protozoa, and fungi.

In the 17th century, scientists like Antonie van Leeuwenhoek observed and documented these tiny organisms, which were previously unknown. This discovery revolutionized our understanding of the diversity and complexity of life, as well as the role of microorganisms in disease and ecosystems.

Cell Theory: The microscope played a crucial role in the formulation of the cell theory, which states that all living organisms are composed of cells, and cells are the basic units of life.

In the 19th century, scientists like Robert Hooke and Matthias Schleiden observed and described cells under the microscope, leading to the realization that cells are fundamental building blocks of all living things. This understanding laid the foundation for modern biology.

Subcellular Structures: Microscopy allowed scientists to investigate and discover the intricate structures within cells.

The development of more advanced microscopes, such as electron microscopes, enabled the visualization of subcellular components like organelles (e.g., mitochondria, nucleus, endoplasmic reticulum) and cellular processes like mitosis and meiosis. These discoveries deepened our understanding of cell function and the complex machinery of life.

Study of Tissues and Organs: Microscopes enabled the study of tissues and organs at a microscopic level. Histology, the study of tissues, became possible, leading to the identification and classification of different types of tissues and their organization into organs.

This knowledge provided insights into the structure and function of different organs in the human body and other organisms.

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The steps for the base-excision repair of DNA in chronological order:
1. DNA-repair enzyme binds double helix and flips out the damaged base.
2. Glycosidic bond is cleaved to release the damaged base.
3. AP endonuclease nicks the backbone.
4. Phosphodiesterase removes the deoxyribose phosphate unit.
5. DNA polymerase I fills in the gap.
6. DNA ligase seals the strand.

The chronological order for base-excision repair of DNA is as follows: First, the DNA-repair enzyme binds the double helix and flips out the damaged base. Then, the glycosidic bond is cleaved to release the damaged base. Next, the AP endonuclease nicks the backbone, and phosphodiesterase removes the deoxyribose phosphate unit. Finally, DNA polymerase I fills in the gap, and DNA ligase seals the strand.

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Sensory adaptation is the phenomenon by which our senses become less responsive to constant or repetitive stimuli over time.

In the case of vision, this can lead to a decreased sensitivity to certain colors, patterns, or movements if they are repeatedly presented.

However, the human visual system employs several mechanisms to avoid sensory adaptation. For example, the eyes are constantly in motion, which helps to continually refresh the images on the retina and prevent adaptation.

Additionally, the brain actively processes and interprets visual information, allowing us to perceive and respond to changes in our environment.

Finally, our attentional system helps to selectively focus on relevant stimuli, further reducing the risk of sensory adaptation.

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Malonate is a competitive inhibitor of succinate dehydrogenase, which is an enzyme involved in the citric acid cycle and the electron transport chain.

As succinate dehydrogenase is inhibited by malonate, the flow of electrons from succinate to ubiquinone in the electron transport chain would be blocked.

This would result in a decrease in the electron transport chain's ability to generate a proton gradient across the inner mitochondrial membrane, leading to a decrease in ATP synthesis.

Additionally, as the citrate cycle is linked to the electron transport chain, the inhibition of succinate dehydrogenase by malonate would result in the accumulation of succinate in the mitochondria. This accumulation would lead to a reduction in the availability of oxaloacetate, which is a critical molecule in the citrate cycle. As a result, the citrate cycle would slow down, leading to a reduction in the production of ATP through oxidative phosphorylation.

In summary, malonate inhibition of succinate dehydrogenase would lead to a decrease in electron flow in the electron transport chain, a decrease in the production of a proton gradient, a decrease in ATP synthesis, and a reduction in the rate of the citrate cycle.

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After eating a balanced meal, the metabolic pathway that will predominate is oxidative glycolysis. The correct option is C.

A balanced meal typically consists of a mix of carbohydrates, proteins, and fats. The carbohydrates from the meal are broken down into glucose, which enters the cells and undergoes glycolysis. Glycolysis is the metabolic pathway that converts glucose into pyruvate, producing a small amount of ATP and NADH in the process.

During oxidative glycolysis, pyruvate is further metabolized in the mitochondria through the citric acid cycle (also known as the Krebs cycle) and oxidative phosphorylation. These processes generate a significant amount of ATP through the utilization of oxygen and produce carbon dioxide as a byproduct.

The other options listed - lipolysis, gluconeogenesis, and deamination - are metabolic pathways that are more prominent during fasting or periods of energy deprivation. Lipolysis involves the breakdown of stored fats to release fatty acids for energy, gluconeogenesis is the synthesis of glucose from non-carbohydrate sources (such as amino acids or glycerol), and deamination is the removal of amino groups from amino acids.

In summary, after eating a balanced meal, oxidative glycolysis is the metabolic pathway that will predominate as the body utilizes the glucose derived from the meal to produce ATP through the citric acid cycle and oxidative phosphorylation.

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The product of cyclopentadiene dimerization is a Diels-Alder adduct.

The explanation is that cyclopentadiene can act as both a diene and a dienophile in a Diels-Alder reaction, meaning that it can undergo self-cycloaddition to form a dimer through a Diels-Alder mechanism.

The resulting adduct is a cyclohexene ring system with two fused cyclopentadiene units.

In summary, cyclopentadiene readily dimerizes to form a Diels-Alder adduct, which is a cyclohexene ring system with two fused cyclopentadiene units.

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The bone that can withstand stresses of several tons per square inch is the femur, option B.

The femur, also known as the thigh bone, is the longest and strongest bone in the human body. It is located in the upper leg and connects the hip to the knee.

The femur is designed to bear and distribute weight, making it highly resistant to the forces and stresses placed upon it.

Its structure consists of a dense outer layer called cortical bone, which provides strength, and a spongy inner layer called trabecular bone, which helps absorb and distribute forces.

These features allow the femur to withstand substantial pressure and support the body's weight during activities like walking, running, and jumping.

While other bones, such as the tibia and fibula, also play important roles in supporting the body, the femur is specifically known for its exceptional strength and ability to withstand significant stresses, making it the bone that can handle several tons per square inch.

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The primary difference between simple diffusion and facilitated diffusion is the mechanism by which substances cross the cell membrane.

In simple diffusion, small, nonpolar molecules such as oxygen and carbon dioxide can move directly through the lipid bilayer of the cell membrane, while larger or polar molecules require a transport protein to facilitate their movement. In contrast, facilitated diffusion always involves the use of transport proteins to facilitate the movement of substances across the membrane.

Despite this difference, both simple and facilitated diffusion rely on the concentration gradient to drive the movement of substances across the cell membrane. As the concentration of a substance increases on one side of the membrane, it will tend to move to the other side until the concentration is equal on both sides. This process occurs spontaneously without the need for any input of energy from the cell.

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VITA/TCE (Volunteer Income Tax Assistance/Tax Counseling for the Elderly) sites are required to conduct quality reviews: d. of all returns prepared by volunteers with certification levels below advanced, military, or international.

Quality Reviews are an important aspect of the VITA/TCE program to ensure accuracy and compliance with tax laws. These reviews help maintain the quality and integrity of the tax returns prepared by volunteers. The specific requirement is to review all returns prepared by volunteers with certification levels below Advanced, Military, or International.

Volunteers with certification levels below Advanced, Military, or International are typically those who are still developing their skills or have not completed the higher-level certification courses. By reviewing their returns, the VITA/TCE sites can provide feedback, identify errors or discrepancies, and ensure that the tax returns meet the required standards.

VITA/TCE sites need to have a system in place to conduct these Quality Reviews regularly to maintain the accuracy and reliability of the services provided to taxpayers. The exact procedures and frequency of Quality Reviews may vary based on the specific guidelines and requirements of the VITA/TCE program at the local or national level.

Therefore, the correct option is D.

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The hydrolysis of sucrose allows glucose and fructose to enter the glycolytic pathway and be used as sources of energy. The glycolytic pathway is a key metabolic pathway in cells that generates ATP and provides intermediates for other metabolic pathways.

Sucrose (Suc) is a disaccharide made up of glucose (Glc) and fructose (Fru) molecules linked together by an α,β-glycosidic bond. In glycolysis, sucrose enters the series of reactions after it is hydrolyzed into its constituent monosaccharides, glucose and fructose. This hydrolysis reaction is catalyzed by the enzyme sucrase, which cleaves the α,β-glycosidic bond between the Glc and Fru molecules.

Once glucose and fructose are released by the hydrolysis of sucrose, they can enter the glycolytic pathway at different points. Glucose is phosphorylated by the enzyme hexokinase to form glucose-6-phosphate, which is the first step in the glycolytic pathway. Fructose, on the other hand, is phosphorylated by the enzyme fructokinase to form fructose-1-phosphate, which can be converted to glyceraldehyde-3-phosphate and dihydroxyacetone phosphate, two intermediates in the glycolytic pathway.

Overall, the hydrolysis of sucrose allows glucose and fructose to enter the glycolytic pathway and be used as sources of energy. The glycolytic pathway is a key metabolic pathway in cells that generates ATP and provides intermediates for other metabolic pathways.

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The most common cause of female infertility is ovulatory disorders, such as polycystic ovary syndrome (PCOS).

PCOS is a hormonal disorder that affects a woman's ovaries, causing irregular menstrual cycles and making it difficult for eggs to mature and be released for fertilization.

Other causes of ovulatory disorders can include thyroid dysfunction, premature ovarian failure, and certain medications.

Other possible causes of female infertility include:

Tubal factors, such as blocked or damaged fallopian tubes, which can prevent fertilization or implantation of a fertilized egg.

Uterine factors, such as abnormalities of the uterus or cervix that can make it difficult for a fertilized egg to implant and develop.

Endometriosis, a condition in which the tissue that normally lines the uterus grows outside of the uterus, causing pain and inflammation that can interfere with fertility.

Age-related factors, as a woman's fertility declines with age, particularly after age 35.

Other medical conditions or lifestyle factors, such as obesity, diabetes, autoimmune disorders, or certain infections.

Treatment for infertility will depend on the underlying cause, and may involve medications, surgery, or assisted reproductive technologies such as in vitro fertilization (IVF).

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When an ideal gas expands through an adiabatic process, the gas expands without any heat exchange with its surroundings ,the internal energy of the gas decreases as it does work on the environment during expansion,the temperature of the gas decreases during the adiabatic expansion.

When an ideal gas expands through an adiabatic process, the following statements are true:

1. The process is reversible.

2. The internal energy of the gas decreases.

3. The temperature of the gas decreases.

4. The pressure of the gas decreases.

An ideal gas expanding through an adiabatic process has the following true statements:
1. The gas expands without any heat exchange with its surroundings.
2. The internal energy of the gas decreases as it does work on the environment during expansion.
3. The temperature of the gas decreases during the adiabatic expansion.
Remember that an adiabatic process is characterized by no heat exchange (Q=0), and for an ideal gas, only the energy used for work affects the internal energy and temperature.

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an ideal gas expands through an adiabatic process .Given statements are true.

In an adiabatic process, the transfer of heat is absent, i.e., no exchange of heat takes place between the system and the surroundings. The system undergoes an adiabatic process when it expands under the condition of constant internal energy.

The following statements are true for an ideal gas that expands through an adiabatic process:

The adiabatic process can be represented by the equation P{Vgamma } = constant, where P is the pressure, V is the volume, and γ is the adiabatic index, and the value of γ depends on the nature of the gas. The adiabatic process is a process in which no heat is lost or gained by the system and its surroundings, and the system's energy is solely due to the work done on the system.

The internal energy of the ideal gas changes only due to the work done by the gas during the adiabatic process, which is given by the equation ΔU = -W.

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The statement that does NOT apply to myasthenia gravis is Dementia develops in the later stage. The correct option is d.

Myasthenia gravis is a chronic autoimmune disorder that affects the neuromuscular junctions. It is characterized by muscle weakness and fatigue, particularly in the face, neck, and limbs. The underlying cause of myasthenia gravis is the production of autoantibodies that target and damage specific cholinergic receptors at the neuromuscular junctions. These receptors are responsible for transmitting signals from nerves to muscles, and their impairment leads to communication problems between nerves and muscles, resulting in muscle weakness and fatigue.

Dementia is not a characteristic feature of myasthenia gravis. Dementia refers to a decline in cognitive function, including memory, thinking, and reasoning abilities. Myasthenia gravis primarily affects the neuromuscular system, and cognitive impairment is not a typical manifestation of the condition. However, it is possible for individuals with myasthenia gravis to experience cognitive symptoms if there are complications or comorbidities present, but it is not a direct consequence of myasthenia gravis itself.

Therefore, option d, which states that dementia develops in the later stage, does not apply to myasthenia gravis.

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J. Craig Venter and his team determined that about 375 of the 525 total genes in the genome of Mycobacterium genitalium are essential for life.

J. Craig Venter and his team conducted research to identify the essential genes in the genome of Mycobacterium genitalium, a bacterium that serves as a model organism for studying minimal genomes. By systematically studying the functions of each gene and its impact on the bacterium's survival, they were able to determine which genes are essential for its life.

The team found that out of the total 525 genes present in the genome of Mycobacterium genitalium, approximately 375 genes are crucial for the bacterium's survival and are deemed essential. These essential genes are responsible for carrying out vital functions necessary for the bacterium's growth, metabolism, replication, and overall viability.

This research provides valuable insights into the minimal gene set required for a free-living organism to sustain life. Understanding the essential genes in a genome can contribute to various fields, including synthetic biology, drug development, and our overall understanding of the fundamental processes that govern life at the genetic level.

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Answer:

E. Determines the number of viable cells.

Explanation:

An advantage of the standard plate count is that it determines the number of viable cells.

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Based on the terms provided, the false statement regarding DNA mismatch repair in E. coli is: If both strands appear to be parental (correct), the mismatch repair system can still repair it. In reality, the mismatch repair system relies on distinguishing between the parental (correct) strand and the newly synthesized (incorrect) strand to ensure proper repair.

The statement that is false regarding DNA mismatch repair in E. coli is "If both strands appear to be parental (correct), the mismatch repair system can still repair it." In reality, if both strands appear to be parental, the mismatch repair system cannot repair the mismatch because it cannot distinguish between the parental strand and the newly synthesized strand. The parental strand is distinguished by its methylation pattern, which is recognized by the mismatch repair system. The system involves exonucleases, which remove the mismatched nucleotide and its neighboring nucleotides before DNA polymerase fills in the gap with the correct nucleotides. A single mismatch can indeed require replacing hundreds of nucleotides on the unmethylated strand, as the mismatch repair system must remove and replace all nucleotides that were synthesized after the mismatch occurred.

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The characteristic that bacteria can do but eukaryotes like humans can't do is use operons.

Operons are functional units found in bacterial DNA that consist of a cluster of genes controlled by a single promoter. They allow for coordinated gene expression, as the genes within an operon are transcribed together as a single mRNA molecule. This arrangement enables bacteria to regulate the expression of multiple genes simultaneously and efficiently respond to environmental changes. In contrast, eukaryotes like humans do not typically utilize operons for gene expression regulation. Instead, eukaryotic genes are typically transcribed individually, and their expression is regulated by various mechanisms such as transcription factors and enhancers. While eukaryotes have more complex gene expression regulation systems, the use of operons is a specific characteristic of bacteria, allowing them to efficiently coordinate gene expression in response to their environment.

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Protein residues are best developed into fingerprint impressions with:

b. Ninhydrin.

Ninhydrin is a chemical compound that reacts with amino acids in proteins to produce a purple or blue color, making it ideal for developing latent fingerprints left on porous surfaces such as paper.

When ninhydrin is applied to a surface containing amino acids, it reacts with them to form a colored compound that can be visualized under UV light. This reaction is specific to amino acids, which are found in proteins, and therefore makes ninhydrin an effective tool for developing protein-rich fingerprints.

Iodine and physical developer are more commonly used to develop fingerprints on non-porous surfaces, while dusting powder is used to visualize latent prints on a variety of surfaces.

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Imprinting refers to an epigenetic phenomenon where certain genes are marked or "imprinted" during gamete formation, resulting in their expression being silenced or activated based on the parent of origin.

Imprinting plays a critical role in normal development and gene regulation. However, alterations or abnormalities in the imprinting process can contribute to the development of human genetic disorders.

Imprinting disorders arise when there are errors in the epigenetic marks on imprinted genes. For instance, if an imprinted gene from the father is erroneously silenced or if an imprinted gene from the mother is abnormally activated, it can disrupt normal development and lead to disease. Examples of imprinting disorders include Beckwith-Wiedemann syndrome (BWS) and Prader-Willi syndrome (PWS).

BWS is characterized by overgrowth, abdominal wall defects, and an increased risk of certain cancers. PWS, on the other hand, involves neonatal hypotonia, developmental delays, and hyperphagia leading to obesity. These conditions are caused by alterations in the imprinted genes on chromosome 11p15 for BWS and chromosome 15q11-q13 for PWS.

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Membrane proteins are integral components of the cell membrane, which plays a critical role in the passage of molecules across cellular membranes. They are involved in a wide variety of functions, ranging from transport of molecules to cell signalling.

They can be classified into three main categories: transporters, receptors, and enzymes. Transporter proteins, such as ion pumps and carriers, are responsible for the movement of molecules across the membrane, allowing the cell to control the concentration of vital ions and molecules. Receptors act as recognition molecules, allowing cells to detect and respond to external stimuli, such as hormones and neurotransmitters.

Finally, enzyme proteins catalyse biochemical reactions, allowing the cell to regulate its own metabolism. Together, these three types of membrane proteins are involved in a variety of cellular processes, which are essential for the functioning of the cell.

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Correct question is :

what are all functions typically carried out by membrane proteins?

Membrane proteins carry out functions such as facilitated transport, active transport, and ion gating. Carrier proteins facilitate the transport of specific substances, while gated channels regulate the movement of ions for electrical transmission or muscle contraction.

Membrane proteins carry out several important functions including facilitated transport, active transport, and gating of ions. Carrier proteins are involved in facilitated transport, allowing specific substances to move across the plasma membrane. Gated channels, such as those for sodium, potassium, and calcium, regulate the movement of ions, facilitating electrical transmission in nerve cells or muscle contraction in muscle cells.

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FILL IN THE BLANK: the beta-hemolysis of blood agar observed with Streptococcus pyogenes is due to the presence of streptolysin O.

Beta-hemolysis refers to the complete lysis of red blood cells, resulting in a clear zone around the bacterial colonies on blood agar. Streptococcus pyogenes, a pathogenic bacterium responsible for various infections, produces an exotoxin called streptolysin O. Streptolysin O is a hemolysin that binds to cholesterol in the host cell membranes, forming pores that disrupt the integrity of the red blood cells. This lysis of the red blood cells leads to the characteristic beta-hemolytic appearance on blood agar plates. The presence of streptolysin O allows S. pyogenes to acquire essential nutrients from the lysed red blood cells and evade the host immune response.

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False. A neuron can receive information from multiple neurons, not just one. Neurons are specialized cells that transmit nerve impulses, which enable communication between different parts of the nervous system and the body. Each neuron has a cell body, an axon, and numerous dendrites.

Dendrites are branch-like structures that receive information from other neurons and transmit it to the cell body. A single neuron can have many dendrites, allowing it to receive input from numerous other neurons. This complex network of connections is vital for the proper functioning of the nervous system, as it facilitates the integration and processing of information from various sources.

When a neuron receives an input from another neuron, the signal can either be excitatory or inhibitory. Excitatory signals increase the likelihood of the receiving neuron generating an action potential, while inhibitory signals decrease this likelihood. The neuron's response depends on the sum of these excitatory and inhibitory signals, with the neuron only generating an action potential if the threshold is reached.

Thus, he statement that a neuron can only receive information from one neuron is false, as neurons can and do receive input from multiple neurons to efficiently process and transmit information within the nervous system.

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To determine the expected biomass of rodents in a tightly coupled food chain, we would need additional information such as the energy transfer efficiency or trophic level ratios, which are not provided in the given question. Therefore, it is not possible to calculate the specific biomass of rodents based solely on the given information.

In a tightly coupled food chain, the transfer of energy and biomass between trophic levels is typically high, with little energy loss. However, without information about the energy transfer efficiency or trophic level ratios, we cannot accurately determine the biomass of the rodents.

The given food chain, "grass>beetle>rodent>eagle," indicates the direction of energy flow, but it does not provide specific values or relationships between trophic levels. To estimate the biomass of rodents, we would need additional data on factors such as the productivity of the ecosystem, the efficiency of energy transfer between trophic levels, and the distribution of energy among the different organisms within the food chain.

Without these additional details, it is not possible to calculate the biomass of the rodents based solely on the given information of the grass biomass.

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The statement that is true for the kilograms of grain required for each kilogram added to an animal's body weight is option E: Cows require more grain than pigs.

Based on the given options, cows and pigs are compared in terms of the amount of grain required for each kilogram added to their body weight. Option E states that cows require more grain than pigs. This means that to increase their body weight by one kilogram, cows need a larger amount of grain compared to pigs.

The statement in option E aligns with the general understanding of animal husbandry and feeding practices. Cows are ruminant animals with a complex digestive system that relies on consuming large amounts of forage and fiber. Due to their larger size and specialized digestive process, cows require a higher intake of grain or forage to support their growth and maintenance.

On the other hand, pigs are monogastric animals with a simpler digestive system. They are generally more efficient in converting feed into body weight gain compared to cows. Pigs have a higher feed efficiency and can gain weight with a relatively lower amount of grain compared to cows.

In summary, option E correctly states that cows require more grain than pigs for each kilogram added to their body weight, reflecting the different feeding requirements and digestive processes of these two animal species.

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The correct answer is option B.

The inferior third of the esophagus is the region that is composed of smooth muscle only.

The region of the esophagus that is composed of smooth muscle only is known as the lower esophageal sphincter (LES) or gastroesophageal sphincter. The LES is located at the junction of the esophagus and the stomach, and its primary function is to prevent the backflow of stomach contents into the esophagus.

The LES is composed of a ring of smooth muscle that is under both voluntary and involuntary control, allowing it to open and close as needed to regulate the movement of food and liquids into the stomach. Disorders of the LES, such as its failure to relax or close properly, can lead to conditions such as gastroesophageal reflux disease (GERD) or achalasia.

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Of the ratites, the ostrich is the one that has just two toes.

Ratites are a group of flightless birds characterized by the absence of a keel on their sternum, which is necessary for flight muscle attachment.

They include species like ostriches, emus, cassowaries, rheas, and kiwis. However, the ostrich stands out as the largest and heaviest living bird, and it possesses two toes on each foot.

This distinctive feature sets it apart from other ratites that typically have three or more toes. The ostrich's two-toed feet are well adapted for running and provide stability and balance, enabling the bird to reach remarkable speeds of up to 70 kilometers per hour (43 miles per hour).

These powerful legs and toes allow the ostrich to navigate its terrestrial environment with agility and efficiency.

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In anatomy, the terms "distal" and "proximal" are used to describe the position of body parts in relation to the center of the body or to other body parts.

The term "distal" refers to the part of a limb or bone that is farthest from the center of the body or from another point of reference.

For example, the distal end of the femur is the end that is farthest from the hip joint, while the distal end of the radius is the end that is farthest from the elbow joint.

Conversely, the term "proximal" refers to the part of a limb or bone that is closest to the center of the body or to another point of reference. For example, the proximal end of the femur is the end that is closest to the hip joint, while the proximal end of the radius is the end that is closest to the elbow joint.

Understanding these terms is essential for describing the location and orientation of body parts accurately and is particularly important in medical imaging, surgery, and physical therapy.

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The system that provides the force to move bones about their joints (B) Muscular system.

The muscular system is responsible for providing the force needed to move bones about their joints. It consists of different types of muscles, including skeletal muscles, which are attached to bones via tendons.

When muscles contract, they generate tension and pull on the bones, causing movement at the joints. This allows for various activities such as walking, running, lifting, and even small intricate movements like writing or typing.

The nervous system plays a role in coordinating muscle contractions by sending signals from the brain to the muscles, but it is the muscular system itself that generates the force required for movement.

Therefore, option B, the muscular system, is the correct answer as it provides the force to move bones about their joints.

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Complete question :

Which system provides the force to move bones about their joints ?

A. Nervous

B. Muscular

C. Integumentary

D. Skeletal

C, amino acids

The building blocks of proteins are amino acids, which are small organic molecules that consist of an alpha (central) carbon atom linked to an amino group, a carboxyl group, a hydrogen atom, and a variable component called a side chain.

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