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NEET 2023
Exam
NEET
Year
2023
Subject
Zoology
Chapter
Molecular Basis of Inheritance

NEET 2023 · Zoology · Molecular Basis of Inheritance

With reference to Hershey and Chase experiments. Select the correct...

With reference to Hershey and Chase experiments. Select the correct statements. (A) Viruses grown in the presence of radioactive phosphorus contained radioactive DNA. (B) Viruses grown on radioactive sulphur contained radioactive proteins. (C) Viruses grown on radioactive phosphorus contained radioactive protein. (D) Viruses grown on radioactive sulphur contained radioactive DNA. (E) Viruses grown on radioactive protein contained radioactive DNA. Choose the most appropriate answer from the options given below :

Options

  1. A(A)(A) and (C)(C) only
  2. B(B)(B) and (D)(D) only
  3. C(D)(D) and (E)(E) only
  4. D(A)(A) and (B)(B) only

Correct answer

D. (A)(A) and (B)(B) only

Step-by-step solution

In Hershey and Chase experiment, after centrifugation the bacterial cells showed the presence of a radioactive DNA labelled with P32\mathrm{P}^{32} while radioactive protein labelled with S35\mathrm{S}^{35} appeared outside the bacterial cell i.e. in the medium. Labelled DNA was also found in the next generation of phage. Bacteria that were infected with viruses that had radioactive protein were not radioactive. Statement A and B are correct. Hence option (4) is correct.
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