CBSE Class 11-science Answered
Expert Answer
Salient features of B-DNA are as follows:
The two strands of polynucleotides run anti-parallel.
The backbone of the double helical structure is formed by the sugar-phosphate-sugar chain.
The nitrogenous bases lie perpendicular to the backbone of the molecule. They lie on the inner side.
There is a complementary base pairing between two anti-parallel strands. Example: A pairs with T and G pairs with C. A and T are paired by the formation of two hydrogen bonds, and G and C are paired by the formation of three hydrogen bonds.
Each strand of DNA appears like a helical staircase.
Each step of the strand is represented by a pair of bases.
At each step, the strand turns 36°.
One full turn of the strand involves 10 base pairs.
The distance between two successive sugar molecules is 3.4
.
ANSWERED BY EXPERT ANSWERED BY EXPERT ANSWERED BY EXPERT ANSWERED BY EXPERT ANSWERED BY EXPERT ANSWERED BY EXPERT ANSWERED BY EXPERT ANSWERED BY EXPERT ANSWERED BY EXPERT
