12th Class Biology Molecular basis of inheritance

  • question_answer 18)     The fact that a purine always paired base through hydrogen bonds with apyrimidine base leads to, in the DNA double helix (a) the antiparallel nature                                            (b) the semi conservative nature (c) uniform width throughout DNA                          (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 bonding gives uniform width to the DNA.

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