Difficulty: Medium
Average Score: 65%
Entry Exam
What action does an enzyme perform that increases the rate of a biological reaction?
Correct answer
A
Rationale
Correct Answer: A - Lowers the activation energy.
Rationale:
1. Enzymes lower activation energy needed for a reaction to occur by stabilizing the transition state.
2. This accelerates the reaction rate without being consumed in the process.
3. Choice B is incorrect as enzymes do not physically remove the energy barrier.
4. Choice C is incorrect as enzymes do not change the substrate but rather facilitate the reaction.
5. Choice D is incorrect as enzymes do not alter their active sites during reactions; the sites remain unchanged.
Rationale:
1. Enzymes lower activation energy needed for a reaction to occur by stabilizing the transition state.
2. This accelerates the reaction rate without being consumed in the process.
3. Choice B is incorrect as enzymes do not physically remove the energy barrier.
4. Choice C is incorrect as enzymes do not change the substrate but rather facilitate the reaction.
5. Choice D is incorrect as enzymes do not alter their active sites during reactions; the sites remain unchanged.