Enzyme Quiz
  • 1. A catalyst will make a reaction
A) go in different directions
B) stop
C) slow down
D) speed up
  • 2. A cell contains
A) one enzyme that promotes photosynthesis and one enzymes that promotes cellular respiration
B) thousands of different enzymes, each prompting a different reaction
C) approximately 100 kinds of enzymes, each promoting a different chemical 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) break down more starch molecules
B) not be reused
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) lowering the pH
B) participating in chemical reactions
C) increasing the temperature
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) most cellular reactions require a specific, unique enzyme
B) enzymes are quickly used up
C) they have to have some way to use up the protein that they consume
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) pH
C) temperature
D) concentration of reactants
  • 8. Enzyme names always end with the suffix
A) -ite
B) -ase
C) -ose
D) -ene
  • 9. Enzymes
A) all choices are correct
B) are proteins
C) are affected by temperature and pH
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) absorbing water released when polymers are formed
C) affecting the rate at which reactions occur
D) combining with excess hydrogen to form gaseous wastes
  • 11. Enzymes affect the reactions in living cells by changing the
A) speed of the reaction
B) pH of the reaction
C) products of the reaction
D) temperature 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) pH of the environment energy required
C) amount of activation
D) structure of the enzyme
  • 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) 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) in a high-saline environment
D) at low temperatures
  • 16. The amount of energy required for a chemical reaction to begin is called
A) mechanical energy
B) electrical energy
C) chemical 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) amylase can function only in the small intestine
B) the optimum temperature for amylase is 37 degrees C
C) amylase is denatured at temperature below 37 degrees C
D) the lock-and-key model of enzyme action does not apply to amylase
  • 18. The molecule on which an enzyme acts is called a(n)
A) substrate
B) organic molecule
C) active site
D) inactive site
  • 19. The part of the enzyme where the substrate binds is known as the
A) catalyst
B) activation energy
C) active site
D) inhibitor
  • 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) most enzymes can catalyze many different reactions
C) enzymes are sent to specific substrates by ribosomes
D) different enzymes are made in specific areas of the cytoplasm
  • 21. The “lock and key hypothesis” attempts to explain the mechanism of
A) enzyme specificity
B) vacuole formation
C) sharing of electrons
D) . pinocytosis
  • 22. The various enzymes in our bodies are
A) nucleotides
B) lipids
C) carbohydrates
D) proteins
  • 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) lipid
B) manganese dioxide
C) protease
D) galactose
  • 25. Which factor does not alter the rate of hydrolysis of maltose, a disaccharide?
A) number of enzyme molecules present
B) size of the substrate molecule
C) temperature of the environment of the reaction
D) pH of the environment of the reaction
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