Multiple choice

Who discovered that the infective part of virus is nucleic acid?

  1. De Herelle

  2. Hershey and Chase

  3. Lederberg and Tatum

  4. None of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hershey and Chase (1952) proved that DNA, not protein, is the genetic material using bacteriophages labeled with radioactive isotopes (S-35 for protein, P-32 for DNA). Only the DNA entered bacterial cells, demonstrating nucleic acid is the infectious component.