(a)[1]
Use the letter X to mark a point on the sketch graph in Fig. 8.1 at which light intensity is limiting the rate of photosynthesis.
(b(i))[1]
State the name of the enzyme that makes cDNA from an mRNA template.
(b(ii))[1]
State the name of the type of proteins that regulate gene expression in plants.
(b(iii))[3]
Suggest why a greater number of genes were switched on only in plants growing in high light intensity than in plants growing in low light intensity, where fewer genes were switched on.