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Enzyme Function, Interactions & Regulation Chapter Exam

Exam Instructions:

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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Question 1 1. A coenzyme is differentiated from the broader class of cofactors because it is _____.

Question 2 2. Many coenzymes are derived from _____.

Question 3 3. Which of the following statements describes the behavior of an enzyme with a binding site for a positive regulator.

Question 4 4. Which of the following is NOT true of lactase?

Question 5 5. Iron binds tightly to the heme group in the protein hemoglobin. What type(s) of helper molecule would this be considered?

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Question 6 6. Which of the following is true about enzymes?

Question 7 7. An enzyme will reach its saturation point

Question 8 8. Competitive inhibition involves an inhibitor

Question 9 9. Which of the following statements about the reaction shown below is true?

Question 10 10. Ascorbic acid, found in citrus fruits, acts as an inhibitor to catecholase, the enzyme responsible for the browning reaction in fruits such as apples, peaches, and pears. The mechanism of inhibition may be that the pH of the ascorbic acid solution is altering the protein folding of catecholase. If this is true, then this inhibition is most likely an example of what type of inhibition?

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Question 11 11. Which of the following statements is true regarding the characteristics of enzymes?

Question 12 12. What is induced fit?

Question 13 13. Which of the following is NOT true of enzyme regulation?

Question 14 14. Cellular respiration includes a step that converts pyruvate into Acetyl coA. Acetyl coA is also known as Coenzyme A. This implies that Acetyl coA _____.

Question 15 15. Which of the following statements concerning the way coenzymes, cofactors, and prosthetic groups assist enzyme function is NOT true?

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Question 16 16. Which of the following is NOT true of a noncompetitive inhibitor?

Question 17 17. An activator could have the following effect on an enzyme:

Question 18 18. The following conditions can denature an enzyme

Question 19 19. Which of the following would likely NOT increase a reaction rate of an enzyme in your mouth that was not yet at optimal conditions?

Question 20 20. Pepsin works optimally in your stomach due to its

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Question 21 21. The change in overall energy of a reaction is

Question 22 22. The location of substrate binding is called the

Question 23 23. A non-substrate molecule binds to an enzyme. Now the enzyme is unable to bind its substrate. What has likely occurred?

Question 24 24. How does substrate concentration affects the rate of an enzyme-mediated reaction?

Question 25 25. An increase in temperature

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Question 26 26. Ascorbic acid, found in citrus fruits, acts as an inhibitor to catecholase, the enzyme responsible for the browning reaction in fruits such as apples, peaches, and pears. One explanation for the inhibiting function of ascorbic acid could be its similarity, in terms of size and shape, to catechol, the substrate of the browning reaction. If this explanation is correct, then this inhibition is most likely an example of _ inhibition.

Question 27 27. You are investigating a new species never before studied. It lives in acidic pools in volcanic craters where temperatures often reach 100°C and normally stay above 90°C. You determine that it has a surface enzyme that catalyzes a reaction leading to its protective coating, and you decide to study this enzyme in the laboratory. Under what conditions would you most likely find optimal activity of this enzyme?

Question 28 28. How do enzymes function?

Question 29 29. Which of the following statements about enzymes is true?

Question 30 30. What type of bond is often formed between prosthetic groups and proteins?

Enzyme Function, Interactions & Regulation Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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