Enzyme Quiz
  • 1. A catalyst will make a reaction
A) speed up
B) go in different directions
C) slow down
D) stop
  • 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) break down more starch molecules
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) neutralizes the acids and bases in the system
B) changes the pH of the system
C) alters the active site of the enzyme
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) 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) temperature
B) concentration of reactants
C) ionic conditions
D) pH
  • 8. Enzyme names always end with the suffix
A) -ite
B) -ene
C) -ase
D) -ose
  • 9. Enzymes
A) are proteins
B) all choices are correct
C) are affected by temperature and pH
D) speed up chemical reactions
  • 10. Enzyme influence chemical reactions in living systems by
A) combining with excess hydrogen to form gaseous wastes
B) providing the substrate required for the reaction to occur
C) absorbing water released when polymers are formed
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) temperature of the reaction
C) pH 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) function of the reactants
C) structure of the enzyme
D) pH of the environment energy required
  • 13. Proteins that reduce the amount of energy needed to start a chemical reaction are called
A) sugars
B) enzymes
C) reactants
D) ions
  • 14. Which aspect of a chemical reaction is affected by enzymes?
A) direction
B) rate
C) equilibrium
D) pH
  • 15. The majority of human enzymes are most effective
A) within a limited pH range
B) in a high-saline environment
C) under low pressure
D) at low temperatures
  • 16. The amount of energy required for a chemical reaction to begin is called
A) chemical energy
B) activation energy
C) electrical 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 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) active site
B) substrate
C) organic molecule
D) inactive site
  • 19. The part of the enzyme where the substrate binds is known as the
A) catalyst
B) inhibitor
C) activation energy
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) most enzymes can catalyze many different reactions
C) enzymes can only bind to specific substrates
D) different enzymes are made in specific areas of the cytoplasm
  • 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) lipids
C) nucleotides
D) carbohydrates
  • 23. Since enzymes are biological catalysts, they
A) prevent reactions from occurring spontaneously
B) require activation energy for a reaction to occur
C) permanently blind to reactants, allowing a reaction to occur
D) raise the activation energy until a reaction begins
  • 24. Which chemical is classified as an enzyme?
A) galactose
B) manganese dioxide
C) lipid
D) protease
  • 25. Which factor does not alter the rate of hydrolysis of maltose, a disaccharide?
A) size of the substrate molecule
B) number of enzyme molecules present
C) temperature of the environment of the reaction
D) pH of the environment of the reaction
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