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Finger [1]
3 years ago
10

Which term describes foreign molecules that activate the immune system?

Biology
2 answers:
baherus [9]3 years ago
5 0
The foreign molecule that activates the immune system are Antigens.
Masteriza [31]3 years ago
4 0

the answer is antigens

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Which substance from the light dependent is a source for the light reactions of photosynthesis?
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The ATP<span> and </span>NADPH<span> which are produced in the light-dependent reactions are utilised as the source of energy in the Calvin Cycle</span>
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Oxidative damage to DNA can often result in the alteration of a single nucleotide.
Harman [31]

Answer:

Repair mechanism for base cleavage (BER)

Explanation:

Repair by base cleavage (BER)

The altered bases are specifically recognized by glycosylases and removed, generating an AP site. The hole is filled by a DNA polymerase that takes the healthy strand as a template. This system arises not only by exposure to external agents, but also by the cell's own activity.

In case of damage in more than one nucleotide, repair by nucleotide excision (NER) is performed.

Nucleotide excision repair (NER)

The damaged area is recognized by UvrA and B, then A and B separate and UvrC enters which forms a complex with endonuclease activity with B. This enzyme cuts the T-dimer and the gap is filled by a DNA polymerase. There is also the TC-NER system (transcription-coupled nucleotide repair system). The alteration of these mechanisms gives rise to diseases such as: Xeroderma pigmentosum, Trichotiodystrophy or Cockayne Syndrome

5 0
3 years ago
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How and why do organisms interact with one another?
dedylja [7]

Answer:

It's in their makeup to interact

Explanation

They need to interact to survive, to exist, to reproduce!

8 0
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The dense area of a cell that contains nucleic acid is the.......
torisob [31]
I think the answer is NUCLEUS.

Hope it helps!
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What is the effect of temperature on the rate of photosynthesis
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<span>Although the light dependent reactions of photosynthesis are not affected by changes in temperature, the light independent reactions of photosynthesis are dependent on temperature. They are reactions catalysed by enzymes. As the enzymes approach their optimum temperatures the overall rate increases.</span>
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