Question
The diagram represents enzyme action in a chemical reaction.
What are parts W, X and Y in this chemical reaction?
▶️ Answer/Explanation
Solution
Ans: C
In the enzyme-catalyzed reaction:
- W represents the enzyme-substrate complex, where the substrate binds to the enzyme’s active site.
- X is the enzyme, which remains unchanged after the reaction.
- Y are the products, formed due to the breakdown or synthesis facilitated by the enzyme.
Thus, the correct labeling is C (Enzyme-substrate complex, Enzyme, Products).
Question
Which of these statements about enzymes are correct?
- enzymes are proteins
- enzymes are used up during chemical reactions
- enzymes speed up metabolic reactions
A) 1, 2 and 3
B) 1 and 2 only
C) 1 and 3 only
D) 2 and 3 only
▶️ Answer/Explanation
Solution
Ans: C
1. Enzymes are proteins – Correct. Most enzymes are globular proteins that act as biological catalysts.
2. Enzymes are used up during reactions – Incorrect. Enzymes remain unchanged after reactions and can be reused.
3. Enzymes speed up metabolic reactions – Correct. They lower activation energy, increasing reaction rates.
Since only statements 1 and 3 are correct, the answer is C (1 and 3 only).