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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