8 - metabolism respiration photosynthesis (SL + HL)

Question 1

explain effects of inhibitors on enzyme activity [8]

Answer 1

• inhibitors restrict the enzyme activity

competitive inhibition
- CI has similar shape to substrate
- when bind to active site, blocks the active site and prevents substrate from binding
- increase in substrate concentration reduces inhibition

non-competitive inhibition
- NCI binds to allosteric site
- NCI has different shape to substrate
- binding leads to conformation change of active site, prevent substrate from binding
- increase in substrate concentration does not reduce inhibition

Question 2

define metabolism

Answer 2

chemical reactions inside cell that are controlled and catalyzed by enyzmes