Enzyme regulation in metabolism

The allosteric inhibitor of an enzyme

• Causes the enzyme to work faster

• Binds to the active site

• Participates in feedback regulation

• Denatures the enzyme

Which is the enzyme that acts as a regulatory enzyme in a four-step metabolic pathway?

• First enzyme

• Fourth enzyme

• Second enzyme

• Third enzyme

What is an example of an allosteric activator?

• ddATP

• AMP

• ATP

• cAMP

Removal of phosphoryl groups is catalyzed by

• ATCase

• Dinitrogenase reductase

• Protein phosphatases

• Protein kinases

What is the role of an allosteric site on an enzyme?

• It is the site where substrates bind

• It regulates enzyme activity

• It is the site for enzyme denaturation

• It is the site for product release

Which type of enzyme modification can enhance its activity?

• Acetylation

• Ubiquitination

• Dephosphorylation

• Phosphorylation

What is a common characteristic of allosteric enzymes?

• They do not undergo conformational changes

• They are always active

• They have multiple subunits

• They follow Michaelis-Menten kinetics

What is the primary function of enzymes in biological systems?

• To provide energy

• To speed up chemical reactions

• To act as structural components

• To store genetic information.

Tags

NGSS.HS-LS1-1

Usually one enzyme acts only on one substrate.

• True

• False

What is the effect of an allosteric inhibitor on enzyme activity?

• It increases the reaction rate

• It changes the enzyme's substrate specificity

• It decreases the reaction rate

• It has no effect on the enzyme