Describe three characteristics of enzymes.

Award [2] for three correct, [1] for two correct.

enzymes are proteins/polypeptides;

activity depends on 3D/tertiary and quaternary structure;

specificity of action / lock and key/induced fit hypothesis / OWTTE;

catalyses/speeds up rate of reaction/lowers activation energy (of reaction pathway) / are regenerated;

pH dependent;

temperature dependent;

has an active site;

can be inhibited;

This question was generally well done although some candidates need to note that three characteristics are required for the two marks.