NEET Botany Molecular Basis of Inheritance Questions Solved

BOARD

List the salient features of double helix structure of DNA.

Salient features of double helix structure of DNA are:

(i) The amount of adenine is always equal to the amount of thymine and the amount

of guanine is always equal to the amount of cytosine. This generates uniform distance

between the two strands of the helix.

(ii) There is complementary base pairing between the two strands of DNA.

(iii) DNA is made up of two polynucleotide chains, where the backbone is made up of 

sugar and phosphate groups and the nitrogenous bases project towards the centre.

(iv) The pitch of the helix is  3.4 nm and the two strands are right handed coiled.

The distance between a base pair is 0.34 nm.

(v) The two chains have anti parallel polarity. It means if one chain has the polarity

, the other has .

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