Question

in a series of experiments, avery treated heat - killed nonvirulent s bacteria with enzymes that degraded the proteins, dna, and rna of the s bacteria, then mixed this with nonvirulent r bacteria. s cells grew in all cases except the samples with degraded dna. what did this demonstrate?
a) protein from the s bacteria is necessary for bacterial transformation to occur.

b) rna from the s bacteria is necessary for bacterial transformation to occur.

c) protein, dna, and rna from the s bacteria are all necessary for bacterial transformation to occur.

d) dna from the s bacteria is necessary for bacterial transformation to occur.

question 12 (5 points)
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whats the difference between germline mutations and somatic mutations?
a) germline mutations can cause serious problems, while somatic mutations dont.

b) germline mutations are caused by mutagens in the environment, while somatic mutations are inherited from a parent.

c) germline mutations are inherited from a parent, while somatic mutations are

Explanation:

First Question (Avery's experiment)

In Avery's experiment, when proteins or RNA of S bacteria were degraded, S cells still grew (transformation occurred). But when DNA was degraded, S cells didn't grow. This shows that DNA (not protein or RNA) is required for bacterial transformation. Options A, B, and C are incorrect as the experiment shows protein and RNA are not necessary, and only DNA is necessary for transformation.

Second Question (Germline vs Somatic mutations)

(Note: The third option in the image seems cut off, but based on knowledge: Germline mutations occur in germ cells (eggs/sperm) and are inherited by offspring. Somatic mutations occur in somatic (body) cells and are not inherited. Let's analyze the given options:

• Option A: Both can cause serious problems (e.g., somatic mutations in cancer, germline in genetic disorders) → Incorrect.
• Option B: Germline mutations can be inherited or spontaneous; somatic mutations are not inherited and can be caused by mutagens → Incorrect.
• Assuming the third option (cut off) is "Germline mutations are inherited from a parent, while somatic mutations are [not inherited, occur in body cells]": This would be correct. But since the options are partially shown, if we assume the intended correct option is the one stating germline mutations are inherited (as they occur in germ cells and passed to offspring) and somatic are not (occur in body cells, not passed), the correct reasoning is: Germline mutations affect germ cells, so they are passed to offspring (inherited from parent's germ cells), while somatic mutations are in body cells and not passed to offspring. So the correct option (if the third is as assumed) would be the one with this description. If we had to pick from the given (incomplete) options, the first two are incorrect, so the third (even cut off) is likely correct as it aligns with the definition: Germline mutations are inherited (as they are in cells that form gametes), somatic are not (in body cells, not passed).)

• Germline mutations: Occur in germ cells (gametes), so they are passed to offspring (inherited).
• Somatic mutations: Occur in somatic (body) cells, so they are not inherited by offspring.
• Option A: Both can cause serious issues (e.g., somatic in cancer, germline in genetic diseases) → Wrong.
• Option B: Germline can be inherited/spontaneous; somatic not inherited, can be caused by mutagens → Wrong.
• The third option (if stating germline is inherited, somatic not) is correct as per mutation inheritance rules.

Answer:

D) DNA from the S bacteria is necessary for bacterial transformation to occur.