Sample Questions — The DNA
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MCQ
What is the distance between two consecutive base pairs in DNA and why is it important?
✅ Correct Answer: A
This distance between bases maintains the structural integrity and consistent geometry of the helix.
MCQ
Which of the following are purines in DNA?
✅ Correct Answer: A
Purines are double-ringed nitrogenous bases – A and G.
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MCQ
In the DNA double helix, adenine pairs with which base?
✅ Correct Answer: D
Adenine pairs with thymine via two hydrogen bonds in DNA.
MCQ
Assertion (A): In DNA, the amount of purines equals pyrimidines.
Reason (R): Chargaff’s rule states that A pairs with T and G with C.
✅ Correct Answer: A
This is explained by base pairing; purine and pyrimidine amounts are equal in double-stranded DNA.
MCQ
Who proposed the famous double helix structure of DNA?
✅ Correct Answer: B
Watson and Crick proposed the double helical model in 1953 based on X-ray data.
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