Given figure represents the DNA double helix model as proposed by Watson and Crick (1953). Select the option that shows correct measurements of A, B and C :-
A
A-34 nm, B-0.34 nm, C-2 nm
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B
A-34 nm, B-3.4, C-20 nm
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C
A-3.4Å, B-0.4Å, C-20 Å
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D
A-34Å, B-3.4 Å, C-2Å
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Solution
The correct option is A A-34 nm, B-0.34 nm, C-2 nm The DNA helix makes one complete spiral turn every 3.4 nm and has a diameter of 2 nm. The distance between adjacent stacks is 0.34 nm.
Labelling of above diagram is as follows-
A- 3.4 nm
B- 0.34 nm
C- 2 nm