First slide

The DNA

Question

Double helix model of DNA has a pitch of

Easy

A

0.34 nm
B

3.4 nm
C

3.4 Å
D

34 nm

Solution

The pitch of the helix is 3.4 nm (a nanometre is one billionth of a metre, that is 10^-9 m) and there are roughly 10 bp in each turn.

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