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How many base pairs are there in every helical turn of Watson-Crick double helix model?

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How many base pairs are there in every helical turn of Watson-Crick double helix model?

(a) 32.3

(b) 11.6

(c) 20

(d) 10.4

The question was posed to me in an internship interview.

The query is from Structure of dsDNA topic in portion Biomolecules and Catalysis of Life Sciences

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Right option is (d) 10.4

Explanation: Watson-Crick double helix model consists of 10.4 base pairs per helical turn. Since one helical turn formed by 360° and there would be 34.3° twist angle per residue among adjacent base pair.

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