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answer: algae

explanation: because the were the first ones to adapt with water and land...

Answer: RNA polymerase attaches to the promoter

Explanation:Took the test

The first step that occurs in transcription is that RNA polymerase attaches to the promoter.

Hence, the correct answer is: RNA polymerase attaches to the promoter.

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Answer:

Problems with transfection efficiency or absence of essential mRNA modifications (capping and poly-A tail)

Explanation:

Translation is the process of protein synthesis from RNA in which the genetic information encoded in a messenger RNA (mRNA) molecule is translated into a protein sequence composed of amino acids. Translation has three steps: initiation, elongation, and termination. During translation, different elements are required to initiate, continue and complete the process, which include essential molecules such as amino acids, mRNA, tRNAs, ribosomes, energy-carrying molecules (i.e., ATP, GTP), initiation factors (i.e., eIF1A, eIF3, etc) and elongation factors (eEF-2, EIF5A). For example, humans can't synthesize nine essential amino acids (i.e., threonine, tryptophan, phenylalanine, valine, methionine, leucine, histidine, isoleucine, lysine), thereby it is imperative to include these amino acids to synthesize proteins composed of them. On the other hand, it is also fundamental to take into account that the efficiency of transfection of the molecules required during translation, as well as the absence of modifications in the mature mRNA sequence, may alter the process in vitro.

Answer:

there are 4 more phases that occur during meiosis than mitosis

Answer:

The answer is.....

Explanation:

C. Four

Answer:

Ocean

Explanation:

Answer:

The higher the stimulation frequency, the contractions will be more continuous and even additive.

Continuous stimuli reactivate muscle contraction once the action potential cycle is complete.

Explanation:

Muscle contractions can be continuous or cumulative once the action potential curve drops, since the action potential at the top of the mountain is in a refractory period.

I knit a graph of what cumulative contractions are like due to continuous stimulation.

In the graph I leave you pointed out some references:

mr = refractory moment

mnr = non-refractory moment (where the new stimulation is accepted and a more powerful cumulative muscle contraction is generated)

PA = potential for muscle action or contraction itself.

Answer:

During the uterine month there are different phases through which the uterus passes, these phases are regulated by hormones and are responsible for producing the cycle necessary for fertilization.

Phase where menstruation occurs: This phase only happens if the woman was not fertilized and did not develop the diploid cell together with a sperm, since not being fertilized, all the uterine preparation that had been planned in the body for fertilization will be released as that we know "menstruation", in this phase estrogens and progesterone are low. The inner walls of the unfertilized uterus are released.

Follicular phase, in the follicular phase the ovaries prepare to release an egg and estrogen begins to rise. (From the first day of the period until ovulation)

Proliferative phase, in the proliferative phase, new vessels proliferate and the outermost layer of the uterus prepares itself for possible fertilization, is where spiral arterioles can begin to form again in the external cut of the myometrium.

Ovulation, here is where the mature ovum is called Graff's follicle, at this time estrogen reaches its peak and then descends.

Luteal phase, in the luteal phase the production of the luteal body is generated, at this stage progesterone takes center stage, and it is the range between ovulation and menstruation (if not fertilized)

Last phase, secret phase, in this phase there are two possible ends, if the woman is fertilized, the egg cell implants and begins the development of the embryo and if it is not fertilized, the entire external cut of the myometrium is prepared to be secreted.

Explanation:

A very important fact to clarify is that women are born with a quantity of ovules that at the end of this uterine cycle ceases to exist, this process is what we know as menopause.

That is to say that women have a quantity of ovules that will one day run out, and the body releases them from the menarche or the first menstruation, generating that in each released ovule a uterine cycle is completed, the day they end the woman will have reached menopause and would have no chance of being fertilized or completing the uterine cycle.

superficial layer of the endometrium is shed

basal layer of endometrium grows, forms gland and blood vessels

enriched endometrial blood supply

endometrial glands secrete nutrients into uterus

Answer:

The correct answer is "r-selected species".

Explanation:

The terms "k-selected" and "r-selected" species are used to describe two different type of evolutionary strategies. K-selected species are those who have few offspring that are well adapted to its environment and require a lot of resources to growth and survive. On the other hand, r-selected species have a large number of offspring, which not require living on stable conditions and can survive with few resources. The most invasive species are r-selected, since they reproduce very quickly and can adapt to survive to very different ecological conditions.

Answer:

D. Alternative mRNA processing.

Explanation:

Answer:

Photosynthesis: 6CO₂ + 6H₂O + solar energy ----> C₆H₁₂O₆ + 6O₂

Cellular Respiration: C₆H₁₂O₆ + 6O₂ ----> 6CO₂ + 6H₂O + ATP

Hope that helps.

The correct equation for cellular respiration and one for photosynthesis are:

Photosynthesis: 6CO₂ + 6H₂O + solar energy ----> C₆H₁₂O₆ + 6O₂

Cellular Respiration: C₆H₁₂O₆ + 6O₂ ----> 6CO₂ + 6H₂O + ATP

Cellular respiration is a process of converting food into energy that can be used in many processes. It happens when oxygen is combined with food material and releases carbon dioxide as a waste product.

The correct reaction of photosynthesis is when carbon dioxide and water are combined with sunlight to form glucose and oxygen.

The correct reaction of cellular respiration is when glucose and oxygen react and release carbon dioxide and water and energy,

Thus, the correct reactions are:

Photosynthesis: 6CO₂ + 6H₂O + solar energy ----> C₆H₁₂O₆ + 6O₂

Cellular Respiration: C₆H₁₂O₆ + 6O₂ ----> 6CO₂ + 6H₂O + ATP

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The polychaete worms living near the underwater volcanic vent are called Pompeii worms because they look like the ancient Roman city of Pompeii and because they are the most heat-tolerant animals on Earth.

Polychaetes are found in many parts of the world and play many important roles in the environment, such as their importance in marine and freshwater ecosystems. They also have a rich fossil record, which helps scientists study evolution, polychaetes are commonly used as model organisms in biological research, and polychaetes are studied to clean up contaminated environments through bioremediation.

Hence, the polychaete worms living near the underwater volcanic vent are called Pompeii worms because they look like the ancient Roman city of Pompeii and because they are the most heat-tolerant animals on Earth.

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Answer:

1. sphincter muscle and dilator muscle

2. Axial skeleton

Explanation:

1.The iris in the human eye is responsible for controlling the exposure of of light that reaches the retina. The movement of iris is controlled by a muscles called sphincter muscle and dilator muscle. sphincter muscle constricts the pupil in bright light while dilator muscle expands the pupil.

2.  Sternum belongs to the axial skeleton, which is a long flat bone located in the central part of the chest. Axial skeleton consists of 80 bones and strenum is one of them. Axial skeleton functions to provide protection to vital organs such as brain, heart and lungs. Strenum functions to protect heart.

Answer: Option E.

DNA micro array.

Explanation:

DNA microarray is a technique that involves hybridizing cDNA into a chip that contains thousands of single stranded DNA sequences. This technique enables one to study expression of thousands of genes at the same time.looks for extra (duplicated) or missing (deleted) chromosomal segments, sometimes called copy number variants (CNVs).

DNA microarrays are microscope slides which are printed with thousands of tiny spots in specific different positions, and each of the spots contain a known DNA sequence or gene.

primary use of DNA microarrays is transcriptional profiling.

The basic principle behind the DNA microarray is “ nucleic acid hybridization.

Answer:

Parasitic Relationship

Explanation:

Symbiotic relationship:

is a term that defines an interaction between organisms of different organisms.

Parasitic Relationship:

A relationship in which one organism is benefited and one is not.

Example: A tapeworm living at the gastrointestinal parts.

Mutualistic Relationship:

A relationship in which both organisms benefit.

Example: Egyptian plover bird and the crocodile.

Commensal Relationship:

A relationship in which both organisms are not benefited nor harmed.

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Answer:

Answered below

Explanation:

Hemoglobin is found in the red blood cells and is responsible for the transportation of oxygen from the lungs to the various body cells.

Oxygen binds to hemoglobin because it has a high affinity for it. This aids its transportation. When it gets to the cells it unbinds and get transported into the cell for use in energy production.

Carbon monoxide is an odourless, dangerous gas which has more affinity for hemoglobin than oxygen. Therefore when carbon monoxide is inhaled, it quickly binds to hemoglobin, thereby displacing oxygen. It binds to hemoglobin for a longer period and due to this, the body does not get any oxygen and cells begin to die.

Symptoms of carbon monoxide poisoning include dizziness, headaches, fatigue and coma.

Answer:

Telophase I: 8 chromosomes composed of two sister chromatids  

Crossing over refers to the mechanism of recombination, this process being characterized in that increases the genetic variation

Spermatogenesis refers to the mechanism of formation of male gametes (sperms), while oogenesis is the process of formation of female gametes (oocytes)

Explanation:

Telophase I is the final step in meiosis I. During telophase I, the nuclear membrane is formed around the decondensed set of chromosomes and the nucleoli reappear.  

Spermatogenesis refers to the process by which haploid male germ cells (sperms) are generated within the seminiferous tubules in the testis, while oogenesis refers to the process of differentiation of the female egg cells (ova or oocytes) in the ovaries. Spermatogenesis is known to produce small and motile spermatic cells, while oogenesis is known to produce bigger non-motile oocytes.

Answer:

Macro: Phosphorous, Protein, Fat, Carbohydrates

Micro: Vitamin A, Sodium

Explanation:

Macronutrients are nutrients that are needed in large amounts. Micronutrients are needed in smaller amounts.

Answer:

1 C when carbon footprint are reduced

It will reduce the rate of global warming

They could make personal choices that help reduce their carbon

footprints.

                 - Direct emissions, such as those that result from fossil-fuel.

                 - Heating and transportation.

                 - Emissions required to produce the electricity.

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Answer:

This question lacks options, the options are:

A) symbiosis

B) ecosystem

C) community

D) population

E) biosphere

The answer is D) Population

Explanation:

Living organisms in an ecosystem are usually found in numbers living together in a given area. This is termed POPULATION in ecology. A population refers to the group of living organisms that belongs to the same species living together in the same habitat and have the ability to interbreed i.e. mate and reproduce with one another.

This is the case in this question where many sandhill cranes (large flying birds) were observed in a particular area, which represented their habitat. Asides the group of sandhill cranes living together, they were also observed to be interbreeding. This was evident in the observation of two sandhill cranes hopping up and down around their bright orange baby. This shows that members of the population are capable of mating and reproducing fertile offsprings.

This observation completes what a POPULATION is all about, hence, a population was observed.

Answer:

C

Explanation:

Although Ebola isn't transferred by the air and through touch. Bodily fluids like sweat, saliva, urine, breastmilk, semen, and vomit all transmit the disease, if a person gets it in a cut or is directly introduced by it (sexual intercourse.)

Answer:

Xylem is one of the two types of transport tissue in vascular plants, phloem being the other. The basic function of xylem is to transport water from roots to stems and leaves, but it also transports nutrients.

Explanation:

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Answer:

Explanation:

i tack test

Answer:

C

Explanation:

Commensalism is where one organism benefits while the other is neither harmed nor benefited.

A - Both parties benefit

B - Bacteria benefit, the human is harmed

C - Birds benefit, the tree neither

D - Mosquitoes benefit, cow is harmed

Answer:

The structure of the body's organs and systems

Explanation:

In medicine, a cadaver is a dead human body dissected in order to study its anatomical structure. It is employed by medical students and other medical practitioners to study the structure of the human body.

Anatomy is a branch of science that has to do with the study of the structure of living organisms. Relating anatomy to cadaver, these dead bodies are dissected in order to view and study the structure of the different compartments of the body e.g organs, systems etc.

Answer:

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Explanation:

Swimmers push water backwards to propel forwards. In other words, swimmers push their hands and legs against water to move forward. This is stated in the third law of motion, for every action, there is an equal and opposite reaction.

Answer:

a. Angiosperm are plants (autotrophs) that use photosynthesis to produce their own food, while vertebrates are animals (heterotrophs) that obtain their food from other organisms. Vertebrates include fish, amphibians, reptiles, mammals and birds.

b. Adaptations in angiosperms include two reproductive structures 1- fruits (ovaries), whose main function is to disperse the seeds and 2- flowers that ensure pollination and protect the embryo sac during its formation.

c . Examples:

1- The mycorrhizal symbiosis between plant roots and symbiotic fungi plays a key role in nutrient uptake from the soil. Arbuscular mycorrhizal is a type of symbiosis where a fungus of the phylum Glomeromycota penetrates the cortical root cells of vascular plants to produce specialized structures named arbuscules.

2- Microflora in the vertebrate digestive tract. The microorganisms that live in the digestive tract of vertebrate species are beneficial for the absorption of nutrients. For example, in humans, Saccharomyces boulardii has shown to have a probiotic effect by increasing intestinal homeostasis, thereby enhancing nutrient uptake.

Answer:

The sequence is TCAA

Explanation:

Deoxyribonucleic acid (DNA) is a molecule composed of two complementary chains of nucleotides. The nucleotides are in turn composed of one nitrogenous base, one deoxyribose sugar, and one phosphate group. The four different types of nitrogen bases found in DNA are thymine (substituted by Uracil during RNA transcription), adenine, cytosine and guanine. These bases bind by complementary base pairing to form an antiparallel double-strand. The complementary base pairing rule states that thymine forms two hydrogen bonds with adenine, while cytosine forms three hydrogen bonds with guanine.

Answer:

TCAA

Explanation:

A matches to T and G matches to C.

Answer:

The options are

a.cooling of the power plant

b.mining of uranium

c.storage of radioactive waste

d.monitoring the reactor

The answer is b.mining of uranium

Explanation:

Uranium is known as a radioactive element which is used as a fuel to power a nuclear energy plant. Mining of uranium could cause it to mix with air and water which results in contamination.

When contamination occurs and it gets into the body of humans or animals by inhalation or ingestion it poses a high risk of cancer and kidney damage.

Answer:

d. All of the above

Explanation:

The theory of endosymbiosis is important as it explains the evolution of  eukaryotic cells from prokaryotic cells.

This theory also explains the origin of chloroplast and mitochondria. Several evidences in support of the importance of endosymbiosis in the evolution of  eukaryotic cells are as following:

Chloroplast and mitochondria are the examples of such organelles.

Hence, the correct answer is "d".

Answer:

C. Kidney

Explanation:

The kidney is a vital organ in the human body. It is bean shaped and helps in the filtration of toxic substances and wastes from the body fluids which is then reabsorbed into the bloodstream.

The kidney also controls the level of water, pH and sodium levels. It however controls the blood pH by excretion of hydrogen ions and forming bicarbonate which ensures the blood pH is within its optimal and normal range.

Answer:

kidneys

Explanation:

The kidneys are the body's filtration system, and are responsible for filtering out the fluids in the body. The biproduct of this is called urine and is removed from the body