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Enzymes
Class 9 · Biology · 5 questions
Name: ____________________ Date: ____________
Enzymes are made of:
- A Proteins
- B Carbohydrates
- C Lipids
- D Nucleic acids only
The substance on which an enzyme acts is called the:
- A Substrate
- B Inhibitor
- C Product
- D Coenzyme
Most human enzymes work best at about:
- A 37 degrees C
- B 0 degrees C
- C 100 degrees C
- D 70 degrees C
At a very high temperature, an enzyme:
- A Turns into a carbohydrate
- B Works faster forever
- C Is denatured and stops working
- D Becomes a substrate
The lock and key model explains:
- A How cells divide
- B How plants make food
- C How enzymes fit their specific substrates
- D How blood circulates
Answer key
1. A, 2. A, 3. A, 4. C, 5. C
Enzymes are protein molecules that act as biological catalysts.
The enzyme binds to its substrate and converts it into products.
Human body temperature is about 37 degrees C, which suits most human enzymes.
High heat changes the enzyme's shape so it can no longer fit its substrate.
The active site of an enzyme fits its own substrate like a key in a lock.