NEETBiomoleculesMediumBloom L1

Question

The two polynucleotide chains in DNA are

Options

A.parallel
B.discontinuous
C.antiparallel
D.semiconservative

Solution

(b) [Key Concept: DNA Structure — Antiparallel Strands] The two polynucleotide chains in DNA are ANTIPARALLEL — they run in opposite directions (one runs 5'→3' and the other 3'→5'). This antiparallel arrangement is essential for base pairing (A-T and G-C). The two strands are held together by hydrogen bonds between complementary bases. Semi-conservative refers to DNA replication (not strand arrangement). Discontinuous refers to Okazaki fragments in replication.

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