Historical Basis of Modern Understanding

Review Questions

If DNA of a particular species was analyzed and it was found that it contains 27 percent A, what would be the percentage of C?

  1. 27 percent
  2. 30 percent
  3. 23 percent
  4. 54 percent

Hint:

C

The experiments by Hershey and Chase helped confirm that DNA was the hereditary material on the basis of the finding that:

  1. radioactive phage were found in the pellet
  2. radioactive cells were found in the supernatant
  3. radioactive sulfur was found inside the cell
  4. radioactive phosphorus was found in the cell

Hint:

D

Bacterial transformation is a major concern in many medical settings. Why might health care providers be concerned?

  1. Pathogenic bacteria could introduce disease-causing genes in non-pathogenic bacteria.
  2. Antibiotic resistance genes could be introduced to new bacteria to create “superbugs.”
  3. Bacteriophages could spread DNA encoding toxins to new bacteria.
  4. All of the above.

Hint:

D