Ncert Exercises & Solutions

Q. 4. The fact that a purine always paired base through hydrogen bonds with a pyrimidine base leads to, in the DNA double helix

(a) the antiparallel nature

(b) the semiconservative nature

(d) uniform length in all DNA

(c) The diameter of the strand is always constant due to a pairing of purine (adenine and guanine) and pyrimidine (cytosine and thymine). This specific binding gives a uniform width to the DNA.

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