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- 1. Multiple ChoiceEnzymes arenucleic acidsproteinslipidscarbohydrates
- 2. Multiple ChoiceWhich of the following binds to the active site of an enzyme?substrateproductcodonnone of the above
- 3. Multiple Choice
Based on the graph, what temperature does this enzyme work best?15 C40 C30 C - 4. Multiple ChoiceWhat is the function of an enzyme?enzymes break themselves into small piecesthey slow down chemical reactionsthey speed up chemical reactionsenzymes combine products to form reactants
- 5. Multiple ChoiceWhat happens when enzymes are heated to a high temperature?The enzymes die.The shapes of the enzyme are altered or denaturedThe enzymes' amino acid sequence changes.The enzymes remain the same
- 6. Multiple ChoiceWhich of the following conclusions can be drawn from this graph?The optimum pH of the enzyme is 6.6.The optimum pH of the enzyme is 5.8The enzyme’s activity increases as pH increases 5.0 to 9.0The enzyme’s activity is greater around pH of 8.0 .
- 7. Multiple ChoiceEnzymes are composed of which of the following monomers?amino acidscarbohydratesnucleotidesmonosaccharides
- 8. Multiple ChoiceThe graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?Enzymes increase the energy of the reactants.Enzymes decrease the energy level of the products.Enzyme decrease the activation energy of the reaction.Enzymes reverse the direction of the reaction.
- 9. Multiple Choice
Which of the following are true about enzymes? (Choose all that apply)
Enzymes speed up chemical reactions.
Enzymes react best at a specific temperature.
Enzymes only control ONE type of reaction.
Enzymes are made of fatty acids.
- 10. Multiple ChoiceWhat is another name for enzymes?chemical catalystsmicroorganismsbiological catalystsinorganic catalysts
- 11. Multiple ChoiceThe "lock and key hypothesis" attempts to explain the mechanism of?Vacuole formationPinocytosisSharing of electronsEnzyme specificity
- 12. Multiple ChoiceWhat is the name for the mechanism of enzyme activity?Lock and keyjigsaw puzzlehammer and nailtwo hands pattern
- 13. Multiple ChoiceWhat is a Cataylst?A substance that speeds up a rate of chemical reaction.Molecules that make enzymes work harder and fasterreaction of an enzymeA substance that slows down a rate of chemical reaction.
- 14. Multiple ChoiceThe graph shows the effect of temperature on enzyme action. What characteristic do enzymes E1, E2, and E3 share?Their activity increases between 20°C and 30°C.Their activity is greatest between 5°C and 10°C.Their activity is at a low level between 15°C and 25°C.Their activity is at a high level between 30°C and 40°C.
- 15. Multiple Choice
What is the optimal pH of enzyme A?
8
2
5.7-10
10
- 16. Multiple ChoiceWhat is the pH range of enzyme A?20-3.73.70
- 17. Multiple ChoiceWhich enzyme is most efficient in a basic solution?AB
- 18. Multiple ChoiceWhat is indicated by letter A?enzymeproductsubstrateactive site
- 19. Multiple Choice
Illustration 1 shows sugar that has formed a bond by the action of an enzyme. Illustration 2 shows the enzyme, and Illustration 3 shows the enzyme after the addition of heat.
How does the addition of heat affect the ability of an enzyme to help the sugar molecules form a bond?
Heat allows the sugar molecules to bond more quickly.
Heat provides places on the enzyme for other molecules to bond.
Heat changes the enzyme so that the sugar molecules can no longer bond.
Heat changes the chemical composition of the sugar molecules so they no longer need the enzyme.
- 20. Multiple Choice
Pepsin is an enzyme that helps in the digestion of proteins. The graph shows the effect of pH on pepsin activity.
Which BEST describes the data shown in the graph?
Pepsin functions best in acidic environments.
Pepsin activity is least effective in low pH environments.
Pepsin remains very active over a broad range of pH values.
Pepsin is more active at high pH values than at low pH values.
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