Enzyme Quiz
  • 1. A catalyst will make a reaction
A) speed up
B) stop
C) slow down
D) go in different directions
  • 2. A cell contains
A) thousands of different enzymes, each prompting a different reaction
B) one kind of enzymes that promotes thousands of different chemical reactions
C) approximately 100 kinds of enzymes, each promoting a different chemical reaction
D) one enzyme that promotes photosynthesis and one enzymes that promotes cellular respiration
  • 3. After the enzyme amylase break down a starch molecule, it can
A) alter equilibrium conditions
B) break down more starch molecules
C) not be reused
D) change its shape to adapt to different reactant
  • 4. An animal’s stomach contains enzymes that break down food into smaller molecules that the animal’s cells can use. Enzymes perform this function by
A) changing the ionic concentration
B) lowering the pH
C) participating in chemical reactions
D) increasing the temperature
  • 5. At high temperatures, the rate of enzyme action decreases because the increased heat
A) alters the active site of the enzyme
B) neutralizes the acids and bases in the system
C) changes the pH of the system
D) increases the concentration of the enzyme
  • 6. Cells must produce many different enzymes because
A) they have to have some way to use up the protein that they consume
B) enzymes are quickly used up
C) they have to have some way to use up the protein that they consume
D) most cellular reactions require a specific, unique enzyme
  • 7. Enzymes depend on their structure to function properly. Which of the following does not alter an enzyme’s structure?
A) concentration of reactants
B) pH
C) temperature
D) ionic conditions
  • 8. Enzyme names always end with the suffix
A) -ose
B) -ene
C) -ase
D) -ite
  • 9. Enzymes
A) speed up chemical reactions
B) are proteins
C) are affected by temperature and pH
D) all choices are correct
  • 10. Enzyme influence chemical reactions in living systems by
A) absorbing water released when polymers are formed
B) combining with excess hydrogen to form gaseous wastes
C) affecting the rate at which reactions occur
D) providing the substrate required for the reaction to occur
  • 11. Enzymes affect the reactions in living cells by changing the
A) pH of the reaction
B) speed of the reaction
C) temperature of the reaction
D) products of the reaction
  • 12. In an experiment you find that high temperatures reduce enzyme activity. This result is most likely due to the effect of high temperature on the
A) pH of the environment energy required
B) function of the reactants
C) structure of the enzyme
D) amount of activation
  • 13. Proteins that reduce the amount of energy needed to start a chemical reaction are called
A) reactants
B) sugars
C) enzymes
D) ions
  • 14. Which aspect of a chemical reaction is affected by enzymes?
A) direction
B) equilibrium
C) pH
D) rate
  • 15. The majority of human enzymes are most effective
A) at low temperatures
B) within a limited pH range
C) in a high-saline environment
D) under low pressure
  • 16. The amount of energy required for a chemical reaction to begin is called
A) mechanical energy
B) chemical energy
C) electrical energy
D) activation energy
  • 17. The fact that amylase in the human small intestine works best at normal body temperature (37 degrees C) suggests that
A) the lock-and-key model of enzyme action does not apply to amylase
B) amylase can function only in the small intestine
C) amylase is denatured at temperature below 37 degrees C
D) the optimum temperature for amylase is 37 degrees C
  • 18. The molecule on which an enzyme acts is called a(n)
A) organic molecule
B) substrate
C) inactive site
D) active site
  • 19. The part of the enzyme where the substrate binds is known as the
A) inhibitor
B) activation energy
C) catalyst
D) active site
  • 20. Many different enzymes are located in a cell's cytoplasm. How does an enzyme knows which protein it has to work with?
A) enzymes are sent to specific substrates by ribosomes
B) enzymes can only bind to specific substrates
C) most enzymes can catalyze many different reactions
D) different enzymes are made in specific areas of the cytoplasm
  • 21. The “lock and key hypothesis” attempts to explain the mechanism of
A) vacuole formation
B) . pinocytosis
C) sharing of electrons
D) enzyme specificity
  • 22. The various enzymes in our bodies are
A) proteins
B) carbohydrates
C) lipids
D) nucleotides
  • 23. Since enzymes are biological catalysts, they
A) permanently blind to reactants, allowing a reaction to occur
B) require activation energy for a reaction to occur
C) raise the activation energy until a reaction begins
D) prevent reactions from occurring spontaneously
  • 24. Which chemical is classified as an enzyme?
A) protease
B) lipid
C) galactose
D) manganese dioxide
  • 25. Which factor does not alter the rate of hydrolysis of maltose, a disaccharide?
A) pH of the environment of the reaction
B) temperature of the environment of the reaction
C) number of enzyme molecules present
D) size of the substrate molecule
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