The search for genetic material — NEET Biology Questions

Practice 50 questions on The search for genetic material from Molecular Basis of Inheritance (NCERT Class 12, Chapter 5). Free samples below — get all 50 in the app.

50 Questions Molecular Basis of Inheritance Class 12

Sample Questions — The search for genetic material

Try 5 questions below from The search for genetic material. Get all 50 in the MedicNEET app.

MCQ
Why was protein ruled out as genetic material in Avery’s experiment?
  • A. Protease enhanced transformation
  • B. Lipids caused transformation
  • C. DNA was more stable
  • D. Protease had no effect
✅ Correct Answer: D
Destruction of protein did not stop transformation, indicating protein was not responsible.
MCQ
What is the function of protease in Avery’s experiment?
  • A. Break down DNA
  • B. Break down RNA
  • C. Break down protein
  • D. Activate transformation
✅ Correct Answer: C
Protease was used to test if proteins were the transforming substance.
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MCQ
Who first demonstrated the phenomenon of transformation?
  • A. Avery
  • B. Griffith
  • C. Watson
  • D. Hershey
✅ Correct Answer: B
Griffith’s 1928 experiment on Streptococcus pneumoniae showed transformation.
MCQ
What method did Hershey and Chase use to prove DNA is genetic material?
  • A. Used enzymes to degrade DNA
  • B. Observed DNA under microscope
  • C. Sequenced DNA
  • D. Used radioactive sulfur and phosphorus
✅ Correct Answer: D
Their experiments showed radioactive DNA entered bacteria, not protein, confirming DNA’s role.
MCQ
Why was radioactive sulfur (35S) used to label protein?
  • A. Protein contains phosphorus
  • B. DNA has sulfur
  • C. Sulfur helps in replication
  • D. Proteins contain sulfur
✅ Correct Answer: D
Sulfur is found in amino acids like methionine and cysteine.

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