Question

1-Reactions in cells are generally regulated by regulating the activity of the enzyme that catalyzes that reaction. Broadly speaking, enzyme can be regulated by (a) changing the amount of enzyme present in the cells, or (b) changing the activity of the existing enzymes.

Mark all the ways in which the amount of enzyme can be regulated in cells.

Group of answer choices

Regulating degradation

Regulating Translation

Regulating Transcription

Binding allosteric regulators

2-

Reactions in cells are generally regulated by regulating the activity of the enzyme that catalyzes that reaction. Broadly speaking, enzyme can be regulated by (a) changing the amount of enzyme present in the cells, or (b) changing the activity of the existing enzymes.

Mark all the ways in which the activity of existing enzymes can be regulated in cells.

Group of answer choices

Covalent modifications like phosphorylation

Regulating Translation

Binding of regulators to the enzyme

Regulating degradation

Answer 1

1.In order to change the amount of enzymes in cells, rate of enzyme synthesis and rate of degradation has to be regulated .Hence options 1 (regulating degradation),2 (regulating translation) and 3 (regulating transcription) which directly determine amount of enzymes in cells are right answers.Option 4 is wrong because allosteric regulator can only alter the activity of an enzyme.

2.In order to control the catalytic activity of enzyme, cells employ regulators that bind to enzyme and add covalent modifications.Hence, options 1 and 3 are right.Options 2 and 4 determine amount of enzymes in cells, but not enzyme activity.