Enzyme 101 Session 1 Quiz

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1. Enzymes control all metabolic processes and biochemical reactions in the body, from simple digestion to highly complex immune system response.

True

False

2. Enzymes are the driving force behind all the processes of life from animals to plants and is what keeps food alive.

True

False

3. Enzymes are energy rich proteins that occur naturally in all living things but are not critical for life.

True

False

4. All life processes consist of complex chemical reactions which would not be possible without enzymes as they are the catalyst of such reactions.

True

False

5. What are the main sources of enzymes?

a. Food enzymes

b. Digestive enzymes

c. Metabolic enzymes

d. All of the above

6. Metabolic enzymes are synthesized by our cells.

True

False

7. Metabolic enzymes do not depend on our digestive system to give our cells the proper building blocks of amino acids and cofactors in order to make them.

True

False

8. Without enzymes, reactions take place at a rate far too...

a. slow for the pace of metabolism

b. fast for the pace of metabolism

c. damaging for the pace of metabolism

d. none of the above

9. Enzymes catalyze the hundreds of stepwise reactions of metabolism in which pathways?

a. The Krebs cycle that turns citrate successively to different chemicals until reaching one of the final products in oxaloacetate and then keeping the cycle going to ultimately produce ATP along the way

b. The omega 3 and omega 6 fatty acid metabolism which uses a number of Desaturases and Elongases in order to produce EPA and DHA

c. The conversion of cholesterol to the different steroid hormones

d. All of the above

10. Many drugs act via binding to enzymes in order to inhibit their activity.

True

False

11. Enzymes are proteins that have a primary structure composed of which?

a. Triglycerides

b. Fats

c. Amino Acids

d. Carbohydrates

12. Enzymes

a. Are very selective

b. Can lower the energy barrier of a reaction

c. Are very efficient and precise in their function

d. All of the above

13. The molecule that is acted upon by the enzyme is called what?

a. Substrate

b. Product

c. Substance

d. Reagent

14. The molecule that result from the reaction is called what?

a. Substrate

b. Product

c. Substance

d. Reagent

15. The substrate binds in a specific region of the enzyme. What is that region called?

a. The receiving site

b. The transforming site

c. The active site

d. The latch

16. Enzymes are catalysts and increase the speed of a chemical reaction without themselves undergoing any permanent chemical change.

True

False

17. What stimulates the activation of hydrolytic enzymes?

a. Ultraviolet rays

b. The sun

c. Water

d. Oxygen

18. Enzyme can be denatured or changed in shape and precipitated with which?

a. Salts, solvents, heat, and alcohol

b. Water, sugar, and solids

c. Oxygen, carbon dioxide, and light

d. None of the above

19. Which of these factors do not affect enzyme activity?

a. Temperature

b. pH

c. Enzyme and substrate concentration

d. Molecular weight of the enzyme

20. Every enzyme is made to work in a specific pH range.

True

False

21. Which of the following is not a type of enzyme inhibition?

a. Reversible non-competitive inhibition

b. Reversible competitive inhibition

c. Molecular plugging

d. Irreversible inhibition

22. Which of the following statements is false?

a. Enzymes are reusable

b. Enzymes are not reactants and are not used up during the reaction

c. Once an enzyme binds to a substrate and catalyzes the reaction, the enzyme is released, unchanged, and can be used for another reaction

d. Enzymes can only be used once

23. Which is the primary enzyme in saliva which breaks down carbohydrates into smaller molecules, like sugars?

a. Pepsin

b. Lipase

c. Amylase

d. Protease

24. Lysozymes are enzymes that help to kill what?

a. Bacteria

b. Viruses

c. None of the above

d. Both a and b

25. About 90% of the pancreas is dedicated to making digestive enzymes.

True

False

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