The answer is (5) all of the above
Enzyme activity in cells is controlled by:
- Covalent modifications - Covalent modifications is a
phosphorylation which controls the enzyme activity.
- modulation of expression levels - It controls the activity of
enzyme.
- feedback inhibition - It is a from of enzyme regulation. It
controls the enzyme activity.
- allostrich effectors - It binds the other molecules which
affect the enzyme's regulation. So it also controls enzyme
activity..