Enzyme Practice Test
Assessment
•
Jeffery Schneider
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Biology
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11th Grade
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68 plays
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Medium
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20 questions
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1.
Multiple Choice
Pyruvate kinase, a key enzyme in the glycolysis pathway, is inhibited by the amino acid alanine. The ability of alanine to inhibit the enzyme is not affected by increasing the concentration of substrate. Which of the following best explains the mechanism by which alanine inhibits pyruvate kinase activity?
Alanine binds to an allosteric site of the enzyme, changing the shape of the enzyme’s active site.
Alanine increases the enzyme-substrate binding until the enzyme becomes saturated.
Alanine is a competitive inhibitor that reversibly binds to the active site of the enzyme.
Alanine binds to the substrate, preventing the substrate from being able to bind to the active site of the enzyme.
2.
Multiple Choice
they lower the energy of the reactants to increase the rxn rate
they supply energy to the reaction to increase the rxn rate
they lower the energy of the products to increase the rxn rate
they lower the activation energy of the reaction to increase the rxn rate
3.
Multiple Choice
activation energy
adhesion energy
chemical energy
cohesion energy
4.
Multiple Choice
Enzymes can denature (change shape) when the temperature gets too high.
Enzymes can only be used once in a chemical reaction.
Extreme pH can denature enzymes.
Enzymes speed up chemical reactions.
5.
Multiple Choice
competitive inhibition
allosteric inhibition
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