NEETZoologyMolecular Basis of Inheritance
Select the incorrect statement for the given figure.
Options
- AThe distance between a bp in a helix isbapproximately 3.4 nm.
- BThe plane of one base pair stacks over the other in a double helix. This,in addition to H-bonds, confers stabi
- CAdenine forms two hydrogen bonds with Thymine from opposite strands and vice-versa.
- DGuanine is bonded with Cytosine with three H-bonds.
Correct answer
A. The distance between a bp in a helix isbapproximately 3.4 nm.
Step-by-step solution
The salient features of the Double-helix structure of DNA are as follows: (iv) The two chains are coiled in a right-handed fashion. 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. Consequently, the distance between a bp in a helix is approximately 0.34 nm. (v) The plane of one base pair stacks over the other in a double helix. This, in addition to H-bonds, confers stability of the helical structure (Figure 5.3).