Enzyme Quiz
  • 1. A catalyst will make a reaction
A) stop
B) slow down
C) speed up
D) go in different directions
  • 2. A cell contains
A) one kind of enzymes that promotes thousands of different chemical reactions
B) thousands of different enzymes, each prompting a different reaction
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) not be reused
B) change its shape to adapt to different reactant
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) increases the concentration of the enzyme
D) changes the pH of the system
  • 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) concentration of reactants
B) temperature
C) pH
D) ionic conditions
  • 8. Enzyme names always end with the suffix
A) -ite
B) -ose
C) -ase
D) -ene
  • 9. Enzymes
A) are proteins
B) are affected by temperature and pH
C) all choices are correct
D) speed up chemical reactions
  • 10. Enzyme influence chemical reactions in living systems by
A) providing the substrate required for the reaction to occur
B) affecting the rate at which reactions occur
C) combining with excess hydrogen to form gaseous wastes
D) absorbing water released when polymers are formed
  • 11. Enzymes affect the reactions in living cells by changing the
A) temperature of the reaction
B) pH of the reaction
C) products of the reaction
D) speed 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) function of the reactants
B) structure of the enzyme
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) ions
C) reactants
D) sugars
  • 14. Which aspect of a chemical reaction is affected by enzymes?
A) direction
B) rate
C) pH
D) equilibrium
  • 15. The majority of human enzymes are most effective
A) within a limited pH range
B) at low temperatures
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) electrical energy
C) activation energy
D) chemical 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 is denatured at temperature below 37 degrees C
C) amylase can function only in the small intestine
D) the optimum temperature for amylase is 37 degrees C
  • 18. The molecule on which an enzyme acts is called a(n)
A) inactive site
B) active site
C) organic molecule
D) substrate
  • 19. The part of the enzyme where the substrate binds is known as the
A) active site
B) catalyst
C) inhibitor
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 can only bind to specific substrates
B) enzymes are sent to specific substrates by ribosomes
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) . pinocytosis
B) sharing of electrons
C) enzyme specificity
D) vacuole formation
  • 22. The various enzymes in our bodies are
A) nucleotides
B) carbohydrates
C) proteins
D) lipids
  • 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) prevent reactions from occurring spontaneously
D) permanently blind to reactants, allowing a reaction to occur
  • 24. Which chemical is classified as an enzyme?
A) lipid
B) galactose
C) protease
D) manganese dioxide
  • 25. Which factor does not alter the rate of hydrolysis of maltose, a disaccharide?
A) size of the substrate molecule
B) pH of the environment of the reaction
C) temperature of the environment of the reaction
D) number of enzyme molecules present
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