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  1. Length of one turn of the helix in a b-form DNA is approximately
    1. 3.4 nm
    2. 2 nm
    3. 0.34 nm
    4. 20 nm
Correct Option: A

Length of one turn of DNA helix is 34 Å.
1Å = 10–1 nm

∴ 34 Å = 10–1 × 34 =
34 × 1
 = 3.4 nm
10


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