PATHOLOGY

Detailed explanation-1: -Each molecule of DNA is a double helix formed from two complementary strands of nucleotides held together by hydrogen bonds between G-C and A-T base pairs. Duplication of the genetic information occurs by the use of one DNA strand as a template for formation of a complementary strand.

Detailed explanation-2: -The double helix model of Watson and Crick is known as B-DNA. In B-DNA, the most common double helical structure is found, the double helix is right-handed with about 10-10.5 nucleotides per turn.