Question 1
A student is investigating the effect of temperature on the activity of an enzyme that catalyzes the following reaction:
S + P -> Q
The student sets up five test tubes with the same amount of enzyme and substrate, and places them in different water baths at 10°C, 20°C, 30°C, 40°C, and 50°C. After 10 minutes, the student measures the amount of product formed in each test tube. The results are shown in the table below:
| Temperature (°C) | Product Formed (mg) |
|---|---|
| 10 | 2 |
| 20 | 4 |
| 30 | 6 |
| 40 | 5 |
| 50 | 3 |
- A) 10°C
- B) 20°C
- C) 30°C
- D) 40°C
Question 2
What is an example of a metabolic pathway that involves a cycle of enzyme-catalyzed reactions?
- A) Glycolysis
- B) Krebs cycle
- C) Calvin cycle
- D) Both B and C
Question 3
Which of the following statements best describes the graph?
- A) The graph shows the effect of a competitive inhibitor on the rate of reaction of an enzyme-catalyzed reaction.
- B) The graph shows the effect of a non-competitive inhibitor on the rate of reaction of an enzyme-catalyzed reaction.
- C) The graph shows the effect of a pH on the rate of reaction of an enzyme-catalyzed reaction.
- D) The graph shows the effect of temperature on the rate of reaction of an enzyme-catalyzed reaction.
Question 4
What is the effect of lowering the activation energy of a chemical reaction?
- A) It increases the rate of the reaction by making it more likely to occur.
- B) It decreases the rate of the reaction by making it less likely to occur.
- C) It changes the equilibrium constant of the reaction by altering the free energy change.
- D) It has no effect on the rate or equilibrium of the reaction.
Question 5
Following image shows a series of enzyme catalyzed reactions which is controlled by end-product-inhibition.
Which statement describes the end-product-inhibition?
- A) If product X accumulates, it inhibits the production of Intermediate A.
- B) End-product inhibition causes a build-up of intermediary products.
- C) Product X inhibits Enzyme 3, so no more product X is produced.
- D) Product X affects the structure of Initial substrate.