Answers>Biology>A Level>Article

How are polynucleotide DNA strands held together? (3 marks)

The two antiparallel strands of DNA are held together by hydrogen bonds joining the bases of each complementary nucleotide; Adenine is held to Thymine by 2 hydrogen bonds, and Guanine to Cytosine by 3 hydrogen bonds.

SA

Related Biology A Level answers

All answers ▸

What is the difference between DNA and mRNA?

Emma C. avatarAnswered by Emma C.

What happens during mitosis

Ruth W. avatarAnswered by Ruth W.

Describe the process of oxidative phosphorylation

Thomas B. avatarAnswered by Thomas B.

Describe the process of DNA replication?

Mohammad H. avatarAnswered by Mohammad H.