Exam 20: Enzymes

Which of the following is true of a noncompetitive inhibitor?

Sulfanilamide prevents bacterial growth because it functions as a competitive inhibitor.

Inhibition is the irreversible process by which enzymes are rendered nonfunctional.

Which disease is attributed to the lack of enzyme?

Ethylene glycol (antifreeze)poisoning can be avoided if methanol is administered shortly after ingesting the ethylene glycol.

Chymotrypsin,an enzyme that cleaves peptide linkages,would be classified as a(n)_____ .

The region of an enzyme where the substrate molecule fits is called the

The conditions required for maximum enzyme function are called

Which of the following enzyme properties is explained by the lock-and-key model?

____ is an example of a cofactor required by an enzyme.

Zymogen is another term for cofactor.

The conversion of a zymogen into an enzyme usually involves another enzyme.

An enzyme is operating at its optimum pH.If the pH were increased,how would the rate of the enzyme-catalyzed reaction change?

The lock-and-key theory is the explanation of how a coenzyme functions to modify the substrate which provides a specific product.

Isoenzymes vary from each other because they contain different isotopes of elements like carbon,nitrogen,oxygen and sulfur.

The substrate for the digestive enzyme named sucrase is _____ .

An irreversible inhibitor usually forms a covalent bond with the enzyme.

An enzyme valuable in diagnosing heart attacks is _____ .

While most enzymes increase the rate of a reaction by providing a new mechanism with a lower activation energy,there are several examples where they can also increase the activation energy and slow down or stop a reaction.

Pepsin is named because it catalyzes a hydrolysis reaction,and the IEC uses "in" as the word ending to indicate hydrolysis reaction.