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
Answered by Srishti A. Biology tutor

8045 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

Use your knowledge of the actin and myosin mechanism of muscle contraction to explain how a vesicle might be "walked" along the cytoskeleton of a cell.


List the ways in which arteries and veins differ


Describe how acetylcoenzyme A is formed in the link reaction.


What are the different types of immunity?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences