Enzymes
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Preview questions (no answers)
- 1.
Which molecule is produced when maltase breaks down maltose?
A.Glucose
B.Starch
C.Amino acid
D.Glycerol
- 2.
Why can a small amount of enzyme catalyze the reaction of a large amount of substrate?
A.Because enzymes are very large
B.Because enzymes are not used up in the reaction
C.Because enzymes turn into substrates
D.Because enzymes work very slowly
- 3.
What does 'complementary shape' mean in enzyme action?
A.The enzyme and substrate have the same shape
B.The enzyme and substrate have shapes that fit together precisely
C.The enzyme is much larger than the substrate
D.The shapes repel each other
Download the worksheet for Enzymes - Enzyme action to practice offline. It includes additional chapter-level practice questions.
Effects of temperature and pH
SubtopicEffects of temperature and pH under Enzymes for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
Which of the following pH values is most likely the optimum for an enzyme found in human blood?
A.pH 2.1
B.pH 7.4
C.pH 11.5
D.pH 4.5
- 2.
Most enzymes are sensitive to changes in pH because pH affects:
A.The amount of substrate available
B.The chemical bonds that determine the enzyme's shape
C.The temperature of the solution
D.The color of the enzyme
- 3.
Why does an enzyme-controlled reaction slow down as the temperature drops below the optimum?
A.The enzyme is destroyed by the cold
B.The substrate molecules freeze solid
C.Molecules move slower, leading to fewer collisions
D.The active site becomes too large
Download the worksheet for Enzymes - Effects of temperature and pH to practice offline. It includes additional chapter-level practice questions.