(a)[3]
Use Fig. 5.1 to label the structure of an ATP molecule.
(b(i))[1]
State which event, A, B, C or D, needs ATP.
(b(ii))[1]
Arrange the letters A to D in the order in which they occur during the loading of sucrose into a phloem sieve tube.
(b(iii))[1]
State the term used for any region in a plant where sucrose is loaded into a phloem sieve tube.
(c(i))[2]
Explain why a specific amino acid must be attached to a particular tRNA molecule.
(c(ii))[2]
The pH of the cytoplasm of most cells changes only a little around pH $7$. At extreme pH values, enzymes may become denatured. Explain how the structure of an enzyme such as aminoacyl tRNA synthetase would change if the cytoplasm became too acidic.
(c(iii))[2]
Aminoacyl tRNA synthetase works by the induced fit mechanism. Explain the induced fit mechanism.