Multiple choice

MacLeod and McCarthy identified the main substance of transformation in bacteria as

  1. RNA

  2. DNA

  3. Plasmid

  4. Cytoplasm
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

MacLeod and McCarty (with Avery) identified DNA as the transforming substance in their famous 1944 experiment on bacteria. They demonstrated that purified DNA from virulent bacteria could transform non-virulent bacteria, providing strong evidence that DNA was the genetic material. This was a landmark discovery in molecular biology.

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