Enzyme Catalysis

Question 1 of 4

Animation 8.1 Quiz

Reactants called _______ bind to an enzyme’s _______ site where a chemical reaction takes place.

regulators; modification

cofactors; metabolic

catalysts; regulatory

substrates; active

Correct. See Key Concept 8.3 Enzymes Speed Up Biochemical Transformations

Incorrect. See Key Concept 8.3 Enzymes Speed Up Biochemical Transformations

Animation 8.1 Quiz

An enzyme alters a chemical reaction by

increasing the time needed for reaction.

decreasing the rate of collision between reactants.

increasing the overall rate of product formation.

decreasing the probability that reactants will combine.

Correct. See Key Concept 8.3 Enzymes Speed Up Biochemical Transformations

Incorrect. See Key Concept 8.3 Enzymes Speed Up Biochemical Transformations

Animation 8.1 Quiz

A scientist discovers that a compound inhibits the action of an enzyme. What experiment can he perform to determine whether the compound is a competitive or noncompetitive inhibitor?

Raise the concentrations of the reactants to see if activity can be restored through reactant competition with the inhibitor for binding at the active site.

Analyze the products of the enzyme-catalyzed reaction in the presence and absence of the inhibitor to see if the inhibitor changes their chemical composition.

Analyze the enzyme under conditions when the inhibitor is bound to see if the binding interaction between inhibitor and enzyme is covalent or noncovalent.

Raise the concentration of the inhibitor to see if it binds to more than one binding site on the enzyme.

Correct. See Key Concept 8.5 Enzyme Activities Can Be Regulated

Incorrect. See Key Concept 8.5 Enzyme Activities Can Be Regulated

Animation 8.1 Quiz

Refer to the table below.

A biochemist studying an enzyme compared the effects of increasing substrate concentration on the rate of reaction with and without an inhibitor present. The data are shown in the table above. Which of the following statements is consistent with these data?

The inhibitor could be a competitive inhibitor.

The inhibitor could be a noncompetitive inhibitor.

The inhibitor could be both a competitive and noncompetitive inhibitor.

The inhibitor cannot be a competitive or noncompetitive inhibitor.

Correct. See Key Concept 8.5 Enzyme Activities Can Be Regulated

Incorrect. See Key Concept 8.5 Enzyme Activities Can Be Regulated

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Chapter 1. Enzyme Catalysis