Enzyme Quiz
  • 1. A catalyst will make a reaction
A) stop
B) go in different directions
C) slow down
D) speed up
  • 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 kind of enzymes that promotes thousands of different chemical reactions
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) break down more starch molecules
C) alter equilibrium conditions
D) change its shape to adapt to different reactant
  • 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) changing the ionic concentration
C) participating in chemical reactions
D) lowering the pH
  • 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) they have to have some way to use up the protein that they consume
C) most cellular reactions require a specific, unique enzyme
D) enzymes are quickly used up
  • 7. Enzymes depend on their structure to function properly. Which of the following does not alter an enzyme’s structure?
A) pH
B) concentration of reactants
C) temperature
D) ionic conditions
  • 8. Enzyme names always end with the suffix
A) -ene
B) -ase
C) -ose
D) -ite
  • 9. Enzymes
A) speed up chemical reactions
B) all choices are correct
C) are affected by temperature and pH
D) are proteins
  • 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) 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) temperature of the reaction
C) products 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) pH of the environment energy required
B) structure of the enzyme
C) function of the reactants
D) amount of activation
  • 13. Proteins that reduce the amount of energy needed to start a chemical reaction are called
A) sugars
B) ions
C) enzymes
D) reactants
  • 14. Which aspect of a chemical reaction is affected by enzymes?
A) rate
B) equilibrium
C) pH
D) direction
  • 15. The majority of human enzymes are most effective
A) in a high-saline environment
B) at low temperatures
C) within a limited pH range
D) under low pressure
  • 16. The amount of energy required for a chemical reaction to begin is called
A) electrical energy
B) activation energy
C) mechanical 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) amylase is denatured at temperature below 37 degrees C
B) the optimum temperature for amylase is 37 degrees C
C) amylase can function only in the small intestine
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) inactive site
B) organic molecule
C) active site
D) substrate
  • 19. The part of the enzyme where the substrate binds is known as the
A) catalyst
B) active site
C) activation energy
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) most enzymes can catalyze many different reactions
B) enzymes can only bind to specific substrates
C) different enzymes are made in specific areas of the cytoplasm
D) enzymes are sent to specific substrates by ribosomes
  • 21. The “lock and key hypothesis” attempts to explain the mechanism of
A) . pinocytosis
B) sharing of electrons
C) vacuole formation
D) enzyme specificity
  • 22. The various enzymes in our bodies are
A) nucleotides
B) proteins
C) carbohydrates
D) lipids
  • 23. Since enzymes are biological catalysts, they
A) require activation energy for a reaction to occur
B) prevent reactions from occurring spontaneously
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) protease
D) lipid
  • 25. Which factor does not alter the rate of hydrolysis of maltose, a disaccharide?
A) size of the substrate molecule
B) temperature of the environment of the reaction
C) number of enzyme molecules present
D) pH of the environment of the reaction
Studenti hanno provato anche :

Creato con That Quiz — il sito di generazione di test di matematica con risorse per altre aree tematiche.