Double helix model of DNA which was proposed by Watson and Crick was of
A
C-DNA
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B
B-DNA
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C
D-DNA
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D
Z-DNA
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Solution
The correct option is A B-DNA Watson and Crick described double helical model for secondary structure of B-form of DNA which is physiologically most important form of DNA. Later on several other forms of DNA were discovered like A form and Z form.