Describe the structure of DNA

Nucleotides make up DNA. Nucleotides themselves are made up of a phosphate, sugar and base.

They bases are: Adenine (A), Thymine (T), Cytosine (C), Guanosine (G). 

A is bonded to T. C is bonded to G. The bases are bonded by phosphodiester bonds. 

The remaining phosphate and sugar make up the backbone of the DNA, forming two strands on either side of the bases.

These strands then wind around eachother to form the 'double helix' structure. 

ML

Related Biology A Level answers

All answers ▸

How does an action potential travel from one neurone to another?


Describe and explain the series of events leading to excitatory post synaptic stimulation upon the activation of a pacinian corpuscle.


What are the innate and adaptive immune systems and how do their roles overlap?


give an example of a monomer