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Related Questions
Come up with your own " pre-flight" check before driving a car. Describe the importance of each step
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Summer is coming and we are ready to get out and get in the sun. However, sun light has some ultraviolet light. When a UV photon is absorbed by a molecule of DNA, there are different ways the energy can be absorbed. One of the ways is that the energy of the photon can be converted into vibrational energy of the molecular bonds. Excessive vibration can damage the molecule by causing the bonds to break. UV light of less than 290 nm causes significant damage to DNA and UV light of longer wavelength causes minimal damage. What is the threshold photon energy, in eV, for DNA damage
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Answer:
The threshold photon energy for DNA damage = 4.28 eV
Explanation:
According to the Planck - Einstein's equation, the energy of a photon, E is proportional to its frequency; E = hf where f is frequency and h is Planck's constant.
Also, frequency, f = velocity /wavelength
f = c/λ where c is the velocity of light
E = hc/λ
h = 6.63 × 10^-³⁴ Js;
c = 3.0 × 10⁸ m/s;
Threshold wavelength, λ = 290 nm = 2.9 × 10^-7 m
E = (6.63 × 10^-³⁴ × 3.0 × 10⁸) / 2.9 × 10^-⁷
E = 6.85 × 10^-¹⁹ J
1 ev = 1.602 × 10^-¹⁹ J
6.85 × 10^-¹⁹ J = 6.85 × 10^-¹⁹ J × 1 eV / 1.602 × 10^-¹⁹ J = 4.28 eV
Therefore, the threshold photon energy for DNA damage = 4.28 eV
Explain briefly why personal care professionals must study physical anatomy
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Answer:
By understanding how the systems interact, you can determine the proper care for each individual patient and their specific symptoms. With a foundation of anatomy and physiology, you will have the building blocks to make the proper decisions and provide accurate and quality care
Explanation:
Which one ??????????
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PLEASE HELP !! ILL GIVE BRAINLIEST *EXTRA 40 POINTS* DONT SKIP :(( .!
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Answer:
the answer is d, student 2 exercises more often then student 1. he also has better sleep.
Explanation:
Question 17 (1 point) Spindle fibers are structures that radiate from centrioles and play an important role during mitosis. Pick the answer choice that describes their function,
A: Cytoplasm surrounds the spindles and provides protection.
B: Spindle fibers attach to the nuclear envelope and moves the nucleus around the cell.
C: Spindle fibers attach to chromosomes at the centromere and move them to the center of the cell.
D: Spindle fibers protect the cell from damage during DNA replication.
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Answer:
The answer is D
Explanation:
According to the law of conservation of energy, what can happen to the total
energy of a system?
A. The total energy must remain the same, but energy can change
forms and be transferred within the system.
B. Energy must be transferred out of a system if energy is transferred
into the system so that they total energy of the system stays the
same.
C. The total energy can decrease when energy is lost due to energy
transformation within the system.
D. The total energy can increase if energy is transferred into the
system from surroundings.
SUBMIT
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Answer:
the total energy must remain the same,but energy can change forms and be transferred within the system
Which factor is most important when classifying organisms into the same
group?
O A. Similar diets
O B. Shared common names
C. Shared characteristics
O D. Similar locations
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Answer:
C. Shared characteristics
Explanation:
Generally, living organisms are classified into groups based on their characteristics. Organisms that possess same or similar characteristics are grouped together while those that possess different characteristics are grouped separately.
Classification of living organisms include seven (7) levels of organization namely: kingdom, phylum, classes, order, families, genus, and species. Kingdom represent the MOST INCLUSIVE while species represent the MOST EXCLUSIVE i.e. contains the fewest members considering the fact that organisms with the most shared characteristics are grouped as species.
Answer:
d
Explanation:
what do all scientific investigations begin with?
A: Forming a hypothesis
B: Conducting an experiment
C: Asking a question or observing a problem
D: Forming a conclusion
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Take any two words and connect them to form a sentence about photosynthesis.
____________ and ___________ go together because_______________________.
Terms:
Calvin Cycle
Carbon Dioxide
Chlorophyll
Chloroplast
Glucose
Leaf
Light
Light Dependent Reaction
Light Independent Reaction
Oxygen
Photosynthesis
Pores
Product
Reactant
Root
Starch
Sun
Water
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Answer:
Solution:
plant's takes carbon dioxide ,water ,sunlight,and minerals and produce glucose and excrete out oxygen:
PRODUCT and REACTANT go together because any reactants in a chemical equation will result in a product of the reactants.
What are the four steps of natural selection?
Answers
•Variation. Organisms (within populations) exhibit individual variation in appearance and behavior. ...
•Inheritance. Some traits are consistently passed on from parent to offspring. ...
•High rate of population growth. ...
•Differential survival and reproduction
Answer:
reproduction, heredity, variation in fitness or organisms
Explanation:
Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. If they are met, natural selection automatically results.
the law of conservation of mass means that n an isolated system matter cannot be_______
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Answer:
Matter cannot be created nor destoyed
Compare and contrast the autonomic and somatic nervous divisions with respect to
effectors, neurotransmitters, and output cell organization/anatomy.
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Answer:
The somatic nervous system has sensory and motor pathways, whereas the autonomic nervous system only has motor pathways. The autonomic nervous system controls internal organs and glands, while the somatic nervous system controls muscles and movement.
Explanation:
What are the two main ways bacteria cause illness?
A. By releasing toxins that poison your cells
B. By using your cells to make copies of themselves
C. By changing the genetic material inside your cells
D. By breaking down your cells for nutrients
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Answer:
A. By releasing toxins that poison your cells
B. By using your cells to make copies of themselves
Explanation:
Within the body, bacteria can divide (multiply) and kill host cells by disrupting their normal functioning. Moreover, bacteria secrete toxins that are able to destroy host cells' metabolic machinery. For instance, many bacteria synthesize exoenzymes and interferons that disrupt and destroy host cells. Bacterial toxins can be synthesized internally in order to develop sensitivity through antigenic properties.
Explain the importance of using engine powered pump for irrigation works.
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Answer and Explanation:
Engine irrigation pumps are used to propel water into the irrigation channels, providing full water supply to agricultural crops. The use of the engine pump has advantages and disadvantages. Among the advantages, we can present the simplicity of operation of these pumps, being easily operated efficiently. They also save energy and are essential for irrigation with more viscous liquids, when necessary. This feature is the main reason for using this type of pump.
Among the disadvantages we can say that these pumps have a slower and less accurate work.
If several species of carnivores are removed from an ecosystem, the most likely effect on the ecosystem will be an increase in stability among populations.
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i think so since carnivours could lead to effects on ecosystem such as the number or behaviour of their herbivore prey
When a meteor crosses the sky, the light given off is caused by
O Friction
Gravity
O Solar Winds
O Erosion
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Answer:
the answer is EROSION, I Believe
Answer:
Friction
Explanation:
i need help and fast with bio
Answers
I I am really really confused about these two questions does anybody know the answer to both of them
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Answer:
1) Topographic maps show contours, elevation, forest cover, marsh, pipelines, power transmission lines, buildings and various types of boundary lines such as international, provincial and administrative, and many others. (Answer: Elevation)
2) Contour line, a line on a map representing an imaginary line on the land surface, all points of which are at the same elevation above a datum plane, usually mean sea level. The diagram illustrates how contour lines show relief by joining points of equal elevation. (Answer: Contour Line)
The disease multiple sclerosis makes it more difficult for signals from the brain and spinal cord to travel along nerve fibers. How will multiple sclerosis
affect other body tissues?
O Connective tissue will increase its fat storage.
O Muscle tissue will contract uncontrollably.
Epithelial tissue will lose the ability to protect against infection.
Tendons and ligaments will become brittle and break.
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Answer:
O Muscle tissue will contract uncontrollably.
Explanation:
Multiple sclerosis, also known as encephalomyelitis disseminata, is a disease that affects the brain and spinal cord. Some of the most common symptoms of multiple sclerosis include vision problems, arm or leg movement and balance. This disease occurs when the immune system attacks the myelin sheath that covers nerve cells in the brain and spinal cord, causing inflammation and subsequent damage of the sheath and the nerve fibers it surrounds. Multiple sclerosis may cause muscle twitches when nerve fibers are damaged, thereby disrupting the signaling between nerves and muscles.
Please help me understand what I did wrong, Thanks
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Can you curl your tongue? Tongue-curling in humans (T) is a dominant genetic trait. Derek can curl his tongue but his wife, Ashley, cannot. All nine of their children can curl their tongues. Complete the Punnett square based on the genotypes they most likely have.
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Answer: Derek is TT and his wife Ashley tt. Thus children are Tt
Explanation: T Is dominant and t is recessive.
Derek can curl his tongue but his wife, Ashley, cannot. All nine of their children can curl their tongues. Because, the trait of Derek is TT and the trait of his wife Ashley tt.
Thus, the trait of children are Tt
Why Derek cannot curl his tongue?
The tongue rolling ability occurs due to the influence of a dominant allele of the gene. A person who has either one or two copies of the dominant allele will be able to twist their tongue. In the case that a person is born with two recessive alleles, they cannot twist their tongue.
learn more about traits below,
https://brainly.com/question/18484558
#SPJ2
15. Suppose a human blood cell containing a 0.9 percent solute concentration were put into a container of 30 percent solute solution. Would the blood cell get bigger or smaller? Why? In your explanation, you must tell me which area has the hypotonic solution (inside the blood cell or outside the blood cell), which area has the hypertonic solution (inside the blood cell or outside the blood cell), and which direction the water would be moving (into the cell or out of the cell).
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Answer:
Smaller
Explanation:
The human blood cell has a smaller percentage of solute concentration than the solution it was placed into. This means that the cell is hypotonic in comparison to the solution, and the solution is hypertonic compared to the cell. When a cell is placed in a hypertonic solution it undergoes crenation, meaning it shrivels up. Water moves from the lower solute concentration to the higher solute concentration. The water inside the cell moves outside to the hypertonic solution. This causes the cell to become smaller.
What pattern of inheritance is represented punnet square
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Answer:
Autosomal Dominant Inheritance
Explanation:
What is the Society of American Foresters?
A union
A business
A government agency
A professional organization
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explain how incomplete dominance differs from co-dominance
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Answer:
Incomplete dominance is when the phenotypes of the two parents blend together to create a new phenotype for their offspring.
An example is a white flower and a red flower producing pink flowers. Codominance is when the two parent phenotypes are expressed together in the offspring
Explanation:
good luck
Moving substances from a lower concentration to a higher concentration requires _____. passive diffusion facilitated diffusion active transport pinocytosis
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Answer:
Active Transport <3
Explanation:
g Type I diabetes is caused by destruction of the beta cells of the pancreas, the cells that produce insulin. In most cases, the beta cells are destroyed by an immune response. Both genetic and environmental factors are involved in triggering the immune response. A. The immune system usually does NOT destroy the beta cells. If the cells are destroyed, it is a failure of (memory) (specificity)(tolerance) (any one of these) (none of these).
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Answer:
it is a failure of tolerance (self-tolerance) and specificity (recognition)
Explanation:
Type 1 diabetes is a chronic disease caused by the selective destruction of β cells that are involved in the production of insulin in the pancreas. Type 1 diabetes can be classified into two types: Type 1A diabetes (the immune form of the disease) and Type 1B diabetes (the non-immune form of the disease). Type 1A diabetes is considered an autoimmune disorder where immune responses against pathogens suffer a failure of tolerance to antigens in the β-cells of the pancreatic islets. Thus, Type 1A diabetes is characterized by the process of recognition of β-cell antigens (autoantigens) by the immune system. This disease is often caused by genetic factors associated with mutations in the human leukocyte antigen (HLA) class II region located on chromosome 6.
If you squeeze the bottom of a closed tube of toothpaste, the pressure is increased ____.
a.
on the bottom of the tube
c.
on the sides of the tube
b.
on the top of the tube
d.
everywhere in the tube
Please select the best answer from the choices provided
A
B
C
D
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2. A certain recessive, lethal gene is carried on the X chromosome. (Lethal genes are those that result in death.) A man marries a woman who is hybrid for this gene. What sex ratio would be expected among the living children of this couple?
%Male
%Female
Please help me im stuck!
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| Xg | X
—————-
X | XXg | XX
—————-
Y | XgY | XY
Pretty ugly, but the best punnet square I can do without a link. The offspring with the “g” are those that carry the lethal gene. The male child that carries it will die, but since it is recessive, the female child will live but will be a carrier for this gene. I hope this helps.