Q. In DNA, the complementary bases are

A) Uracil and adenine; cytosine and guanine
B) Adenine and thymine; guanine and cytosine
C) Adenine and thymine; guanine and uracil
D) Adenine and guanine; thymine and cytosine
Explanation

[Solution from source] In DNA, adenine pairs with thymine (two hydrogen bonds) and guanine pairs with cytosine (three hydrogen bonds). Uracil occurs in RNA, not DNA, and adenine with guanine would pair two purines, which does not fit the helix. Answer (2).

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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