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Question
In a DNA helix, complementary pairing is always between ______.
Options
A and C
A and G
A and T
C and T
MCQ
Fill in the Blanks
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Solution
In a DNA helix, complementary pairing is always between A and T.
Explanation:
In the Watson and Crick model, adenine pairs only with thymine through two hydrogen bonds. A and C do not pair, so option A and C is wrong. A and G are both purines and cannot pair within the double helix, so option A and G is wrong. C and T do not pair in DNA, so option C and T is wrong.
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