Question

he looked for living s bacterial cells in each of the three batches that contained living r cells. how did the results of averys experiment show that dna transfers heritable information?

a. the samples with destroyed dna did not produce living s strain bacteria.

b. in the samples with intact dna, no s strain bacteria were found.

c. living s cells appeared only in the samples with destroyed proteins.

d. living s cells did not appear in samples that still had intact rna.

Explanation:

Avery's experiment aimed to identify the molecule that transfers heritable information (transforming R cells to S cells). For DNA to be the transforming factor, destroying DNA should prevent transformation. Option A states samples with destroyed DNA didn't produce living S - strain bacteria, which supports DNA as the heritable information carrier. Option B is wrong as intact DNA should allow transformation (so S - strain should be found). Option C is incorrect because the key is about DNA, not destroyed proteins. Option D is irrelevant as the experiment focused on DNA, not RNA's intactness.

Answer:

A. The samples with destroyed DNA did not produce living S strain bacteria.