Medical
Biology
DNA
Eukaryotic Cell
Genetic Code and Mutation
Question

Watson and Crick model of DNA is a

B - form DNA with a spiral length of 34A and a diameter of 20A

A - form DNA with a spiral length of 15A and a diameter of 20A

Z - form DNA with a spiral length of 34A and a diameter of 20A

B - form DNA with a spiral length of 28A and a diameter of 14A

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Solution
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The model of DNA was given by Watson and Crick in the year 1953. It is the hereditary molecules that are responsible for carrying the characters from parents to offspring.

The DNA is in the B - form that shows left-handed coiling.

The  spiral length is 34A and its diameter of 20A. One spiral turn has 10 base pairs.
Thus the correct answer is option (A).