Question

(a) Which of the following forms of DNA are right-handed double helices ?
B-DNA, Z-DNA, D-DNA.
(b) How many base pairs per turn of the helix are these in the following forms of DNA ?
A-DNA, C-DNA and Z-DNA.
( c) What is satellite DNA ?

Answer 1

(a) B-DNA and D-DNA
(b) A-DNA : 11 Base pairs/turn of helix.
C-DNA : 9 Base pairs/turn of helix.
Z-DNA : 12 Base pairs/turn of helix.
( c) Part of DNA having long stretches of repetitive base pairs is called satellite DNA.