Enzymes - Study Solutions

1. The catalytic activity of an enzyme is restricted to its small portion called

Binding site
Catalytic site
Active site
Noe

2. An activated enzyme made of polypeptide chain and a co-factor is

Coenzyme
Apoenzyme
Alloenzyme
Holoenzyme

3. Biochemically enzymes are

Lipids
Proteins
Carbohydrates
All

4. Competitive inhibitors stop an enzyme from working by

blocking the active site of the enzyme
Changing the shape of the enzyme
merging with the substrate instead
Changing the shape of the enzyme

5. Enzyme A requires Zn2+ in order to catalyze the conversion of substrate X. The zinc is best identified as a(n)

Co-enzyme
Prosthetic group
Activator
Substrate

6. The “lock and key” model of enzyme action illustrates that a particular enzyme molecule

Reacts at identical rates under all conditions
Interacts with a specific type of substrate molecule
May be destroyed and resynthesized several times
Forms a permanent enzyme-substrate complex

7. Which antibiotic blocks the active site of an enzyme that many bacteria used to make cell-walls.

Cephalosporin
Gentamicin
Ampicilin
Penicillin

8. At high temperature the rate of enzyme action decreases because the increased heat

Increases the concentration of enzymes
Neutralize acids and bases in the system
Alters the active site of the enzyme
Changes the pH of the system

9. A certain enzyme will hydrolyze egg white but not starch. Which statement best explains this observation?

Starch molecules are too large to be hydrolyzed
Enzyme molecules are specific in their actions
Egg white acts as a coenzyme for hydrolysis
Starch is composed of amino acids.

10. Vitamins are essential to the survival of organisms because vitamins usually function as

Substrates
Apoenzymes
Co-enzymes
Prosthetic groups

11. When a molecule binds to an area of an enzyme that is not the active site, and changes the shape of the enzyme so that it no longer can work, this is called

Denaturation
Competitive inhibition
Noncompetitive inhibition
Substrate denaturation