Enzymes Quiz Questions

1. Enzymes are special types of:

A Both a and b B Proteins C Catalysts D Organelles

2. Enzymes change the ______ of a chemical reaction.

A Reactants B Rate C Type D Product

3. True or False: Enzymes are designed for very specific chemical reactions.

A FALSE B TRUE

4. Where does the reaction between the enzyme and the substrate take place at?

A Activator B Substrate C Inhibitor D Active Sight

5. The new molecules or substances released by the enzyme are called:

A Substrate B Activator C Product D Active Sight

6. What is the name of the molecule or substance that the enzyme reacts with?

A Substrate B Inhibitor C Activator D Active Sight

7. True or False: The lower the temperature, the faster the reaction at the enzyme will occur.

A TRUE B FALSE

8. A higher ______ can increase the reaction rate.

A Concentration of enzyme or substrate B Number of inhibitors C pH D All of the Above

9. Which of the following pH levels will most likely NOT affect enzyme activity?

A 3 B 2 (very low pH) C 12 D 7

10. What are inhibitors?

A Molecules that replace enzymes B Molecules that speed up enzymes C Molecules that make enzymes D Molecules that slow down or stop enzymes

11. Macromolecule chitin is

A a simple polysaccharide B sulphur containing polysaccharide C phosphorous containing polysaccharide D nitrogen containing polysaccharide

12. The nature of an enzyme is

A Lipid B Vitamin C Carbohydrate D Protein

13. In alcoholism, this enzyme is elevated

A acid phosphatase B hepatitis C serum glutamate pyruvate transaminase D glutamyl transpeptidase

14. With regards to enzyme action, this statement is incorrect

A Malonate is a competitive inhibitor of succinic dehydrogenase B the substrate binds with the enzyme at its active site C the non-competitve inhibitor binds the enzyme at a site distinct from that binding the substrate D addition of a lot of succinates does not reverse the inhibition of succinic dehydrogenase by malonate

15. What is the count of genes that determine the synthesis of one enzyme?

A One B Four C Eight D Sixteen

16. This enzyme was first isolated and purified in the form of crystals

A Urease B pepsin C Amylase D Ribonuclease

17. Enzyme-driven metabolic pathways can be made more efficient by

A grouping enzymes into multienzyme free-floating complexes B concentrating enzymes with specific cellular compartments C fixing enzymes into membranes so they are adjacent to each other D all of these

18. Tryptophan synthetase of

A a protein A and one subunit A B a protein designated A C two proteins designated A and B D a protein designated B

19. This statement about enzymes is true

A enzymes accelerate reactions by lowering the activation energy B enzymes are proteins whose three-dimensional form is key to their function C enzymes do not alter the overall change in free energy for a reaction D all of these

20. The enzyme COX-1 is vital for human health in this way:

A it is a chemical derivative of aspirin B catalyzes the hormone-production which maintains the stomach lining C critical for the biosynthesis of DNA D helps in the transportation of carbon dioxide in the blood