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📌 Biology multiple choice questions with answers on enzymes
1. Which of the following factors can lead to the denaturation of an enzyme ?
A) Extreme pH levels
B) High temperatures
C) High salt concentrations
D) All of the above
Answer: D) All of the above
2. Which of the following factors does NOT affect enzyme activity?
A) Temperature
B) pH
C) Concentration of substrate
D) Color of the enzyme
Answer: D) Color of the enzyme
3. What is the term for the specific region on an enzyme where the substrate binds?
A) Active site
B) Allosteric site
C) Substrate site
D) Binding site
Answer: A) Active site
4. Enzymes are highly specific. This means that:
A) They can catalyze any reaction.
B) They can only catalyze reactions involving specific substrates.
C) They can only function at high temperatures.
D) They are not affected by inhibitors.
Answer: B) They can only catalyze reactions involving specific substrates.
5. What is the effect of increasing temperature on enzyme activity, up to a certain point?
A) Enzyme activity decreases steadily.
B) Enzyme activity increases.
C) Enzyme activity remains constant.
D) Enzyme activity becomes irreversible.
Answer: B) Enzyme activity increases.
6. Which of the following statements about enzyme inhibitors is TRUE?
A) They increase the rate of enzyme activity.
B) They bind to the active site and prevent substrate binding.
C) They are always permanent.
D) They have no effect on the enzyme function.
Answer: B) They bind to the active site and prevent substrate binding.
7. What type of enzyme inhibitor binds to the active site of an enzyme?
A) Competitive inhibitor
B) Non-competitive inhibitor
C) Allosteric inhibitor
D) Feedback inhibitor
Answer: A) Competitive inhibitor
8. What is the role of coenzymes in enzymatic reactions?
A) They provide structural support to enzymes.
B) They act as substrates for enzymes.
C) They assist in enzyme activity by donating or accepting electrons or functional groups.
D) They inhibit enzyme activity.
Answer: C) They assist in enzyme activity by donating or accepting electrons or functional groups
9. Which of the following best describes the function of enzymes in biological systems?
A) They provide energy for cellular processes.
B) They speed up chemical reactions by lowering the activation energy.
C) They serve as structural components of cells.
D) They transport substances across cell membranes.
Answer: B) They speed up chemical reactions by lowering the activation energy.
10. What happens to an enzyme after it catalyzes a reaction?
A) It is permanently altered and cannot be reused.
B) It is consumed in the reaction.
C) It is released unchanged and can be used again.
D) It becomes inactive and must be degraded.
Answer: C) It is released unchanged and can be used again.
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1. Which of the following factors can lead to the denaturation of an enzyme ?
A) Extreme pH levels
B) High temperatures
C) High salt concentrations
D) All of the above
Answer: D) All of the above
2. Which of the following factors does NOT affect enzyme activity?
A) Temperature
B) pH
C) Concentration of substrate
D) Color of the enzyme
Answer: D) Color of the enzyme
3. What is the term for the specific region on an enzyme where the substrate binds?
A) Active site
B) Allosteric site
C) Substrate site
D) Binding site
Answer: A) Active site
4. Enzymes are highly specific. This means that:
A) They can catalyze any reaction.
B) They can only catalyze reactions involving specific substrates.
C) They can only function at high temperatures.
D) They are not affected by inhibitors.
Answer: B) They can only catalyze reactions involving specific substrates.
5. What is the effect of increasing temperature on enzyme activity, up to a certain point?
A) Enzyme activity decreases steadily.
B) Enzyme activity increases.
C) Enzyme activity remains constant.
D) Enzyme activity becomes irreversible.
Answer: B) Enzyme activity increases.
6. Which of the following statements about enzyme inhibitors is TRUE?
A) They increase the rate of enzyme activity.
B) They bind to the active site and prevent substrate binding.
C) They are always permanent.
D) They have no effect on the enzyme function.
Answer: B) They bind to the active site and prevent substrate binding.
7. What type of enzyme inhibitor binds to the active site of an enzyme?
A) Competitive inhibitor
B) Non-competitive inhibitor
C) Allosteric inhibitor
D) Feedback inhibitor
Answer: A) Competitive inhibitor
8. What is the role of coenzymes in enzymatic reactions?
A) They provide structural support to enzymes.
B) They act as substrates for enzymes.
C) They assist in enzyme activity by donating or accepting electrons or functional groups.
D) They inhibit enzyme activity.
Answer: C) They assist in enzyme activity by donating or accepting electrons or functional groups
9. Which of the following best describes the function of enzymes in biological systems?
A) They provide energy for cellular processes.
B) They speed up chemical reactions by lowering the activation energy.
C) They serve as structural components of cells.
D) They transport substances across cell membranes.
Answer: B) They speed up chemical reactions by lowering the activation energy.
10. What happens to an enzyme after it catalyzes a reaction?
A) It is permanently altered and cannot be reused.
B) It is consumed in the reaction.
C) It is released unchanged and can be used again.
D) It becomes inactive and must be degraded.
Answer: C) It is released unchanged and can be used again.
@Ethioquizzes
@Ethiomatrichub
@Ethiomatrics