Describe the structure of DNA
DNA is made up of two anti-parallel strands running in opposite directions. It is made up of individual monomers called nucleotides which in turn contain: a sugar (deoxyribose), a base (A, G, C or T), and phosphate group. The sugars and the phosphates bond together resulting in a phosphodiester bond giving rise to the sugar phosphate backbone down one side of the molecule. The four bases are adenine, cytosine, guanine and thymine and form hydrogen-bonds in pairs, A to T and C to G. This is how the two strands stick together. The sequence of bases is what determines the genetic code for the cell.
JH
Related Biology A Level answers
All answers ▸What are the different levels of protein structure and what do they entail?
explain how the nervous system increases heart rate
Starting with mRNa in the cytoplasm, describe how translation leads to the production of a polypeptide ( without including transcription or slicing)
In what circumstances and how do humans anaerobically respire?