Question

Select the incorrectly matched pair.

• A. Purine nucleosides: 1’ – 9' glycosidic linkage.
• B. 3D model of B-DNA, Watson and Crick.
• C. C–value of B-DNA, total amount of DNA in diploid cell.
• D. Adenine and guanine, nine-membered double-ring structures.

Answer 1

Answer: (C)

C-value is the amount of total DNA (in picograms) present in the nucleus of any haploid cell, like gametes.
Purines are nine membered double-ring structure like adenine and guanine.
Purine binds to pentose sugar by 1'-9' glycosidic bond (1^st carbon of pentose sugar is attached with the nitrogen of 9^th position of nitrogen base.
Watson and Crick proposed 3D model of B-DNA.
Polynucleotide chain: