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Biology µGCSE:


10 quick questions - for GCSE and iGCSE



10 minutes maximum! (can you do it in 5?)

1. Where would you find enzymes in a plant cell?
  • A.   cell wall
  • B.   cytoplasm
  • C.   vacuole
  • D.   plasma membrane

2. Which types of biological molecule do enzymes belong to?

  • A.   sugars
  • B.   proteins
  • C.   lipids
  • D.   nucleic Acids

3. Enzymes are Biological Catalysts. Which word would you use to complete this sentence?

"An enzyme ___________a reaction without being used up".

  • A. slows down
  • B. stops
  • C. speeds up
  • D. starts

The diagram shows a simplified enzyme.


What part of an enzyme is X ?

simple enzyme
  • A.  a hole
  • B.  an active site
  • C.  mouth
  • D.  substrate

5. Which temperature irreversibly changes the shape of the part labelled X?

  • A. 0 0C
  • B. 30 0C
  • C. 37 0C
  • D. 60 0C

6. Which row in this table best describes all enzymes?

  All have the same shape Speed up reactions Are affected by pH All are proteins
A ✔️ ✔️ ✔️  
B   ✔️ ✔️ ✔️
C ✔️   ✔️ ✔️
D ✔️ ✔️   ✔️

7. The diagram below shows the function of an enzyme:

enzyme function

What do the labels X, Y and Z indicate?

  X Y Z
A Substrate Product Enzyme
B Enzyme Product Substrate
C Substrate Enzyme Product
D Enzyme Substrate Product

8. The graph below shows how the rate of reaction of an enzyme is affected by temperature:

enzyme reaction with temperature graph

Which of the following best describes labels X and Z on the graph?

  X Z
A The enzyme is working slowly The enzyme is dying
B The substrate is being broken down at a slow rate The amount of substrate is getting less andless
C The enzyme is breaking down the substrate at its fastest rate The amount of substrate is increasing
D The enzyme is breaking down the substrate at its fastest rate The enzyme is becoming denatured

9. Enzymes X and Y are found in different parts of the body. These enzymes function differently in different pH values. The graphs below show the mass of substrate remaining after mixing with the enzyme for a given time.

effect of pH on enzymes - graph

Where might you find X and Y in the digestive system?

  X Y
A Mouth Stomach
B Mouth Small Intestines
C Stomach Small intestines
D Stomach Large intestines

10. The graph below shows how substrate concentration affects the rate of reaction of an enzyme.

effect of substrate concentration on enzymes - graph

To increase the rate of reaction at point X you could...

  • A. decrease the temperature
  • B. increase the pH
  • C. add more substrate
  • D. add more enzyme