Download CHE 102 - Homework - Ch 30a Enzymes Name: Date: 1. Define

CHE 102 - Homework - Ch 30a
Enzymes
Name:
Date:
1. Define Activation Energy and discuss how it controls the rate of a reaction. Draw a reaction/energy diagram
illustrating how a catalyst speeds up a reaction. Be sure to label the: (R)eactants, (P)roducts, (T)ransition
state, Activation Energy (AE) and the Catalyzed Activation Energy (CAE). Is the reaction you drew endothermic or exothermic? Explain
2. What is a Holoenzyme?
3. Chose the set of conditions that would yield a faster enzyme-catalyzed reaction. Explain your answer. (A)
[reactant] = 0.013 M, Temp = 68℃, and an activation energy of 38 kcal/mol vs (B) [reactant] = 0.013 M,
Temp = 55℃, and an activation energy of 38 kcal/mol Explain.
CHE 102 - Homework - Ch 30a
Enzymes
4. What is an enzyme active site? (Use your own words and complete sentences)
5. What is the ”lock-and-key” hypothesis? Why is it a good model? Why is it a bad model? (Use complete
sentences)
6. What does the term ”stereospecific” mean. (Use complete sentences)
7. List 3 ways that a substrate binding to an active site helps the reactants be converted to products. Explain.
(Use complete sentences)
CHE 102 - Homework - Ch 30a
Enzymes
8. Define ”Feedback Inhibition” and ”Feedforward Activation”. (Use complete sentences)
9. The amino acid glutamine is produced by a metabolic pathway in the liver. As the concentration of glutamine
increases the metabolic pathway slows down. Is this control feedforward activation or feedback inhibition?
Explain.
10. Draw a graph illustrating the effect of temperature on the rate of enzyme-catalyzed reactions. Explain why
the enzyme-catalyzed reaction rate decreases at lower temperatures? Label the value on the x-axis that
corresponds to the peak in your graph. (Use complete sentences)
11. What is the difference between Maltose and Maltase?
12. Ubertase catalyzes the reaction that converts ethanol to ethanal. What class of enzymes does Ubertase belong
to? Explain.