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atroni [7]
3 years ago
6

With advancing age, __________ become less responsive to antigens. Additionally, __________ are less responsive, and antibody le

vels do not rise as quickly after antigen exposure.
Biology
1 answer:
diamong [38]3 years ago
7 0

Answer:

1. T cells

2. B cells

Explanation:

With increased age, people become more prone to all infections and produce fewer responses for vaccines. This is due to the lowered levels of function of immune systems against the infections.

With increased age, thymus atrophy and/or hyposecretion of hormones from thymus gland result in reduced activity of T cells against infections. Less number of T cells respond to infections.

The reduced T cell production also makes the B cells less responsive. Reduced responses of B cells towards infection results in slower immune response as antibody levels do not rise quickly.

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Zepler [3.9K]

Answer:

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Explanation:

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A random change in the sequence of DNA is called a
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Answer:

mutation

Explanation:

A mutation is a random change to genetic material. ... If a mutation occurs in a gene that results in a change to the sequence of DNA bases, then the structure of the protein that is made may also be altered. This could alter an individual's phenotype

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3 years ago
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Anon25 [30]

Answer:

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Explanation:

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3 years ago
According to the central dogma, which of the following represents the flow of genetic information in cells?
const2013 [10]

Answer:

DNA to RNA to protein.

Explanation:

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Thus, the correct answer is option (2).

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