Enzyme action Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. What do enzymes do to the activation energy of a reaction?
- A. Raise it
- B. Remove it completely
- C. Lower it
- D. Leave it unchanged
2. Which feature gives an enzyme its specificity?
- A. The shape of its active site, complementary to its substrate
- B. Its high relative molecular mass
- C. The number of substrate molecules present
- D. The temperature of the cell
3. In the induced-fit model, what happens when the substrate binds?
- A. The substrate changes into the product before binding
- B. The enzyme is permanently denatured
- C. The enzyme breaks down into amino acids
- D. The active site changes shape and moulds around the substrate
4. Why was the lock and key model modified?
- A. Enzymes were found not to be proteins
- B. Evidence showed that enzymes can change shape when substrate binds
- C. Enzymes were found to be used up in reactions
- D. Substrates were found to be larger than enzymes
5. Which enzyme is extracellular?
- A. Catalase, which acts in liver cells
- B. An enzyme of respiration in the mitochondrial matrix
- C. Trypsin, which acts in the small intestine lumen
- D. DNA polymerase in the nucleus