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Bezzdna [24]
3 years ago
12

Three parts of a nucleotide

Biology
1 answer:
zalisa [80]3 years ago
7 0

Answer:

Hope this helps!!

Explanation:

1) a five carbon ribose sugar.

2) a phosphate molecule.

3) one of four nitrogenous bases: adenine, guanine, cytosine or uracil.

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Will give brainliest PLEASE HELP NOW!!!!
madreJ [45]

Answer:

The answer should be   NaI→2Na+I2. :)

7 0
3 years ago
Read 2 more answers
A host organism needs time, often days, to mount an immune response against a new antigen, but memory cells permit a rapid respo
nikklg [1K]

Answer:

The answer is <em><u>D. </u></em>

Explanation:

Viruses can evade the processing and presentation of antigens, for example by interfering with the expression of MHC class I proteins, although this increases their susceptibility to be detected by natural killer cells (NK). However, some members of the herpesvirus, papillomavirus, retrovirus, poxvirus and flavivirus families have also developed strategies to escape the attack of NK cells and promote their survival, inhibiting cell apoptosis. Finally, some pathogens often change surface antigens frequently, as in the case of influenza viruses (orthomyxovirus).

The human immunodeficiency virus (HIV) affects CD4 + T cells and degrades the host's ability to counterattack with a strong cell-mediated immune response. There are so many tactics of immune evasion used by HIV, which have so far hindered the development of an effective vaccine.

7 0
3 years ago
Explain why toxic compounds usually have the greatest effect on top-level carnivores
gladu [14]
This is because toxins are ingested by organisms and accumulate in the fatty tissues. Theses toxins then become more concentrated in successive trophic levels of a food web biological magnification. Magnification occurs because the biomass at any given trophic level is produced from a much larger biomass ingested from the level below and therefore, top-level carnivores tend to be the organisms most severely affected by toxic compounds. 
8 0
3 years ago
Which shows that water is entering cells?
kogti [31]
If you want to know how it looks outside of your body then that's when your fingers are wrinkled like if you soak your hands in water or take a long shower or bath that could be when water is entering your cells.
Hope this helps!
4 0
3 years ago
During photosynthesis, the energy used to pump protons comes from ___________, whereas in cellular respiration it comes from ___
Annette [7]

During photosynthesis, the energy used to pump protons comes from ______light_____, whereas in cellular respiration it comes from ______NADH/FADH₂_______.

<h3>What are the steps in photosynthesis?</h3>
  1. The first step in photosynthesis is the absorption of light by chlorophyll bound to chloroplast thylakoid proteins. The absorbed light energy is used to remove electrons from electron donors such as water to form oxygen.
  2. The electrons are then transferred to the primary electron acceptor, quinine (Q.). Electrons are further transferred from the primary electron acceptor to the final electron acceptor (usually NADP⁺).
  3. Proton transfer from the thylakoid lumen to the stroma via the F₀F₁ complex generates ATP from ADP and Pi.
  4. The NADP and ATP produced in steps 2 and 3 provide the energy, and the electrons power the process of reducing the carbon to a six-carbon sugar molecule.

The first three steps of photosynthesis, are directly dependent on light energy and are thus, called light reactions, while the reactions in the last step are independent of light and thus are termed dark reactions.

To know more about photosynthesis visit:

brainly.com/question/1388366

#SPJ4

5 0
1 year ago
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