Covalent Modifications to Enzymes Quiz

What is the primary role of enzymes in chemical reactions?

• To increase the reaction's activation energy

• To decrease the reaction's activation energy

• To change the reaction's products

• To alter the reaction's equilibrium

Which of the following is NOT a small post-translational modification?

• Acetylation

• Methylation

• Glycosylation

• Phosphorylation

How does acetylation affect a lysine residue on a protein?

• It adds a positive charge to the lysine

• It prevents the lysine from carrying a positive charge

• It removes the lysine from the protein

• It converts lysine into another amino acid

What is a zymogen?

• An active enzyme form

• An inactive enzyme form requiring covalent modification

• A type of suicide inhibitor

• A small post-translational modification

What distinguishes suicide inhibitors from other types of enzyme inhibitors?

• They form covalent bonds and rarely unbind

• They can be easily removed from the enzyme

• They bind non-covalently to the enzyme

• They increase the enzyme's activity