Question

This question is based on an experiment in which phages are labeled with either radioactive phosphorous (P) or radioactive sulfur (S) and allowed to infect bacteria. Possible results are as follows:I. P enters bacterial cell. III. P remains outside bacterial cell.II. S enters bacterial cell.IV. S remains outside bacterial cell.

a. I and IV
b. I only
c. II and III
d. II only
e. III only

Answer 1

The correct answer is d. II only. Phages labeled with 32P, which labels DNA, entered the bacterial cells, while the phages labeled with 35S, which labels protein, remained outside the cells.

Step-by-step explanation:

The correct answer is d. II only.

In the Hershey and Chase experiment, phages were labeled with either radioactive phosphorous (32P) or radioactive sulfur (35S). The results showed that only the phages labeled with 32P, which labels DNA, entered the bacterial cells, while the phages labeled with 35S, which labels protein, remained outside the cells. Therefore, option II (S enters bacterial cell) is the only correct statement.