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Q.

Choose the correct statement about Watson-Crick model of DNA.

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a

Two strands of DNA are parallel to one another

b

Backbone of each strand is formed by Nitrogen base – sugar –Phosphate chain

c

Adenine of one strand always pairs with thymine of same strand

d

Each helix consists of 20 nucleotides 

answer is D.

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Detailed Solution

Each helix of Watson-Crick model of DNA has 20 nucleotides with 10 in each strand. The two strands are antiparallel and the backbone of each strand has alternately placed sugar and phosphates joined by phosphodiester bonds. Adenine of one strand pairs with Thymine of opposing strand and Guanine pairs with Cytosine.

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Choose the correct statement about Watson-Crick model of DNA.