What is the structure and function of DNA?
DNA (deoxyribonucleic acid) is a double helix composed of units called nucleotides. Each nucleotide is composed of a single deoxyribose sugar, a phosphate group and one of four nitrogen bases. The 4 bases are adenine, thymine, guanine, and cytosine. Together they form the coded language that creates the human body by being the recipe from which proteins are synthesised.
SD
Related Biology A Level answers
All answers ▸Give three features of an efficient exchange surface. Provide an example for each feature.
Compare the differences between the sympathetic and the parasympathetic nervous system.
What are the key different types of selection?
What is the electron transport chain and what is its function?