Enzyme Quiz
  • 1. A catalyst will make a reaction
A) speed up
B) stop
C) go in different directions
D) slow down
  • 2. A cell contains
A) thousands of different enzymes, each prompting a different reaction
B) approximately 100 kinds of enzymes, each promoting a different chemical reaction
C) one enzyme that promotes photosynthesis and one enzymes that promotes cellular respiration
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) not be reused
B) break down more starch molecules
C) change its shape to adapt to different reactant
D) alter equilibrium conditions
  • 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) increasing the temperature
C) lowering the pH
D) participating in chemical reactions
  • 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) they have to have some way to use up the protein that they consume
B) enzymes are quickly used up
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) ionic conditions
B) temperature
C) concentration of reactants
D) pH
  • 8. Enzyme names always end with the suffix
A) -ene
B) -ite
C) -ose
D) -ase
  • 9. Enzymes
A) are proteins
B) all choices are correct
C) speed up chemical reactions
D) are affected by temperature and pH
  • 10. Enzyme influence chemical reactions in living systems by
A) absorbing water released when polymers are formed
B) providing the substrate required for the reaction to occur
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) pH of the reaction
B) products of the reaction
C) temperature 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) amount of activation
B) structure of the enzyme
C) pH of the environment energy required
D) function of the reactants
  • 13. Proteins that reduce the amount of energy needed to start a chemical reaction are called
A) reactants
B) sugars
C) ions
D) enzymes
  • 14. Which aspect of a chemical reaction is affected by enzymes?
A) rate
B) direction
C) equilibrium
D) pH
  • 15. The majority of human enzymes are most effective
A) under low pressure
B) within a limited pH range
C) at low temperatures
D) in a high-saline environment
  • 16. The amount of energy required for a chemical reaction to begin is called
A) activation energy
B) electrical 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) amylase can function only in the small intestine
B) amylase is denatured at temperature below 37 degrees C
C) the lock-and-key model of enzyme action does not apply to amylase
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) 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) different enzymes are made in specific areas of the cytoplasm
B) most enzymes can catalyze many different reactions
C) enzymes are sent to specific substrates by ribosomes
D) enzymes can only bind to specific substrates
  • 21. The “lock and key hypothesis” attempts to explain the mechanism of
A) sharing of electrons
B) enzyme specificity
C) vacuole formation
D) . pinocytosis
  • 22. The various enzymes in our bodies are
A) proteins
B) carbohydrates
C) nucleotides
D) lipids
  • 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) prevent reactions from occurring spontaneously
D) raise the activation energy until a reaction begins
  • 24. Which chemical is classified as an enzyme?
A) lipid
B) protease
C) manganese dioxide
D) galactose
  • 25. Which factor does not alter the rate of hydrolysis of maltose, a disaccharide?
A) pH of the environment of the reaction
B) size of the substrate molecule
C) temperature of the environment of the reaction
D) number of enzyme molecules present
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