Biochem Chapter 6 part 2

Where do competitive inhibitors bind on an enzyme?

• At the allosteric site

• At the active site

• At the substrate

• At the enzyme-substrate complex

How does temperature generally affect enzyme activity?

• It has no effect

• It always increases activity

• It increases activity up to an optimal point, then decreases

• It always decreases activity

What is an allosteric enzyme?

• An enzyme that binds to the substrate at the active site

• An enzyme that is regulated by molecules binding at a site other than the active site

• An enzyme that is permanently inactive

• An enzyme that only works at high temperatures

What is feedback inhibition?

• A process where the end product of a reaction inhibits the enzyme that produces it

• A process where the substrate enhances enzyme activity

• A process where enzymes are permanently deactivated

• A process where enzymes are activated by heat

What is a positive effector in enzyme regulation?

• A molecule that decreases enzyme activity

• A molecule that increases enzyme activity

• A molecule that has no effect on enzyme activity

• A molecule that permanently deactivates the enzyme

What is covalent modification in the context of enzyme regulation?

• A temporary change in enzyme structure

• A permanent change in enzyme structure

• A reversible change in enzyme activity through the addition or removal of a chemical group

• A change in enzyme activity due to temperature

Which amino acids are commonly modified by phosphorylation?

• Glycine and Alanine

• Serine, Threonine, and Tyrosine

• Valine and Leucine

• Cysteine and Methionine

What are enzymes that add phosphates called?

• Phosphatases

• Kinases

• Dehydrogenases

• Ligases

What is enzyme induction?

• The process of permanently deactivating an enzyme

• The process of increasing enzyme synthesis in response to a molecule

• The process of decreasing enzyme synthesis in response to a molecule

• The process of changing enzyme structure through heat

What is enzyme repression?

• The process of increasing enzyme synthesis in response to a molecule

• The process of decreasing enzyme synthesis in response to a molecule

• The process of permanently activating an enzyme

• The process of changing enzyme structure through pH