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