Year 12 Bio - Periods 60-61

What is the general function of an enzyme inhibitor?

• To speed up an enzyme's function.

• To prevent an enzyme from functioning.

• To change the enzyme's optimum temperature.

• To increase the enzyme's affinity.

In competitive inhibition, what is the shape of the inhibitor molecule similar to?

• The enzyme's active site.

• The product of the reaction.

• The substrate.

• Another enzyme.

Where does a competitive inhibitor bind on the enzyme?

• Anywhere on the enzyme.

• The active site.

• A different part of the enzyme, not the active site.

• The product molecule.

If there is much more of the substrate present than a competitive inhibitor, what happens to the enzyme's function?

• It is completely inhibited.

• Its function rises or that of the inhibitor falls.

• It becomes denatured.

• It speeds up significantly.

In non-competitive inhibition, where does the inhibitor bind on the enzyme?

• The active site.

• The substrate molecule.

• Another part of the enzyme, not the active site.

• The product molecule.

What happens to the enzyme's three-dimensional shape when a non-competitive inhibitor binds?

• It remains unchanged.

• It becomes more rigid.

• It changes, distorting the active site.

• It forms new active sites.

What is the effect of increasing substrate concentration on non-competitive inhibition?

• It increases the inhibition.

• It has no effect on the inhibition.

• It reverses the inhibition completely.

• It causes the enzyme to denature.

What is end product inhibition?

• When the substrate inhibits the enzyme.

• When the product of a metabolic pathway inhibits an enzyme at the beginning of the pathway.

• When an enzyme inhibits its own product.

• When an inhibitor binds to the end product.

What is a common example of competitive inhibition given in the text?

• Ethylene glycol poisoning treated with ethanol.

• End product inhibition in metabolic reactions.

• A non-competitive inhibitor changing enzyme shape.

• Increasing substrate concentration to overcome inhibition.

If the end product of a metabolic reaction is removed or used elsewhere, what happens to the enzyme that was inhibited by it?

• It becomes permanently inactive.

• It returns to its active state.

• It starts to denature.

• It binds to a new substrate.