GB1-LT3

Enzymes ___.

• A. are proteins, except for a few RNAs

• B. lower the activation energy of a reaction

• C. are changed by the reaction they catalyze

• D. Both A and B

Enzymes function as ___.

• A. energy carriers

• B. biological catalysts

• C. gas transporters

• D. structural components

The specificity of an enzyme is due to ___.

• A. its high molecular weight

• B. the shape of its active site

• C. its sensitivity towards pH change

• D. the number of substrate molecules

Enzymes can be denatured by ___.

• A. increasing the pH

• B. changing the substrate

• C. decreasing the temperature

• D. extreme pH or temperature conditions

The specific region of an enzyme that binds to its substrate is called the ___.

• A. activation energy

• B. active site

• C. product

• D. substrate

Enzymes are often named by adding "-ase" to the end of the name of the substrate they act on. What enzyme would act on carbohydrates?

• A. Glycosidase

• B. Lipase

• C. Nuclease

• D. Protease

Enzymes catalyze reactions by lowering the activation energy of a reaction. What is activation energy?

• A. The energy produced by catalysts.

• B. The total energy of a chemical reaction.

• C. The energy released during a chemical reaction.

• D. The energy required to start a chemical reaction.

To which class of enzymes do dehydrogenases, oxidases, and reductases belong?

• A. Ligases

• B. Lyases

• C. Oxidoreductases

• D. Transferases

Enzymes that break down complex carbohydrates into simpler sugars belong to which class?

• A. Hydrolases

• B. Isomerases

• C. Ligases

• D. Lyases

Enzymes that catalyze the transfer of functional groups between molecules are known as ___.

• A. Hydrolases

• B. Isomerases

• C. Oxidoreductases

• D. Transferases