Unit 6a: Enzymes

What happens to the activation energy of a chemical reaction in the presence of an enzyme?

• It rises

• it lowers

• it remains the same

• it stops

What happens to the rate of a chemical reaction in the presence of an enzyme?

• It speeds up

• it slows down

• it remains the same

• it reverses

What does enzyme specificity mean?

• Enzymes can bind universally to any substrate.

• Enzymes can each only bind to a unique type of substrate.

• Enzymes can only be used once.

• Enzymes can be used over and over again.

If the temperature of an enzyme's environment increases too much, which of following would occur?

• Substrate molecules would decrease

• The enzymes would slow down

• The enzyme would become denatured

If the ph of an enzyme's environment becomes too acidic, which of following would occur?

• Enzymatic activity would decrease.

• The enzyme molecules would slow down

• The enzyme would become denatured

• Substrate molecules would increase

Inhibitors

• promote enzyme activity.

• block enzyme activity.

• do no affect enzyme activity

A _____ blocks a substrate from binding to an enzyme.

• competitive inhibitor

• non competitive inhibitor

• cofactor

• coenzyme

A non competitive inhibitor...

• blocks substrates from binding which therefore produces no product

• allows substrates to bind but prevents enzymes from functioning properly

• helps enzymes bind to the substrate which produces product

The difference between cofactors and coenzymes is

• that cofactors only work with inhibitors.

• that coenzymes block substrates.

• that cofactors promote enzyme activity.

• that coenzymes are organic.

Letter A is called

• the substrate

• the enzyme

• the active site

• the product