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atroni [7]
2 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]2 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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Put the following steps in the correct order from 1-9
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Answer:

transcription of mRNA from DNA

small ribosomal subunit binds to mRNA

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Explanation:

The above describes the process of translation in the ribosome. After transcription of DNA to mRNA, the mRNA is taken to the ribosome to undergo translation, here the mRNA binds to the small ribosomal subuits and to other initiation factors; binding at the mRNA binding site on the small ribosomal subunit then the Large ribosomal subunits joins in.

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Then peptide bond formation occurs between the amino acid carried by the tRNA in the p site and the A site. When the ribosome reads a stop codon, the process stops and the polypeptide chain produced is released and the ribosomal subunits dissociates.

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