First slide

The DNA

Question

Which one of the following is correctly matched?

Easy

A

DNA- long polymer of ribonucleotides
B

Dinucleotide- 3'-5' phosphoester linkage
C

Packaging of chromatin at higher level- Requires polyamines
D

B-DNA- Two chains are coiled in a right-handed fashion

Solution

The B-DNA structure was established by Watson and Crick. The two chains are coiled in a right-handed fashion. The pitch of the helix is 3.4 nm.
DNA is a long polymer of deoxyribonucleotides.
Two nucleotides are linked through 3'-5' phosphodiester linkage to form a dinucleotide.
The packaging of chromatin at higher level requires additional set of proteins that collectively are referred to as Non-histone Chromosomal (NHC) proteins.

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