alleryOne strand of a DNA molecule has the base sequence A-G-C-T. What will be the complementary base sequence on the opposite strand?
AT-C-G-A
BA-G-C-T
CU-C-G-A
DT-G-C-A
Answer & Solution
Correct answer: A. T-C-G-A
1. In DNA, A pairs with T and C pairs with G.
2. Pair each base of A-G-C-T with its partner: A pairs T, G pairs C, C pairs G, T pairs A.
3. This gives the complementary strand T-C-G-A.
4. Option C uses uracil, which belongs to RNA, not DNA, so it is wrong.
5. So the complementary sequence is T-C-G-A, option A.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 18 Genetics "Structure of DNA", p.274_
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