Lab Quiz 6 (Bio)

A series of enzymes catalyze the reaction X- Y- Z- A. Product A binds to the enzyme that converts X to Y at a position remote from its active site. This binding decreases the activity of the enzyme. What is substance X?

A substrate

Reactants capable of interacting to form products in a chemical reaction must first overcome thermodynamic barrier know as the reaction's?

Activation energy

A series of enzymes catalyze the reaction X- Y- Z- A. Product A binds to the enzyme that converts X to Y at a position remote from its active site. This binding decreases the activity of the enzyme. With respect to the enzyme that converts X to Y, substrate A functions as?

An allosteric inhibitor

The active site of an enzyme is the region that?

Binds noncompetitive inhibitors of the enzyme

How does a noncompetitive inhibitor decrease the rate of an enzyme reaction?

By changing the shape of the enzyme's active site

Which of the following statements regarding enzymes is true?

Enzyme increase the rate of a reaction by making the reaction more exergonic

Substances that plug up an enzyme's active site are?

Enzyme inhibitors

Mutations that result in single amino acid substitutions in an enzyme

May change the enzyme's optimal temperature or optimal PH

Which component of the following reaction is the enzyme? sucrose+ sucrase+ water - sucrase+ glucose+ fructose

Sucrase

Which of the following statements is true about enzyme-catalyzed reactions?

The reaction is faster than the same reaction in the absence of the enzyme

Which component of the following reaction is the substrate? sucrose+ sucrase+ water - sucrase+ glucose+ fructose

sucrose