CIE iGCSE Co-Ordinated Science B5. Enzymes Exam Style Questions Paper 2
Question
The graph shows the effect of temperature on the rate of an enzyme-controlled reaction.
Which statements are correct?
1 Enzyme molecules denature above 50 ºC and below 20 ºC.
2 Increasing the temperature between 10 ºC and 40 ºC increases the kinetic energy of enzyme molecules.
3 The shape of the active site changes between 40 ºC and 60 ºC.
(A) 1, 2 and 3
(B) 1 and 2 only
(C) 1 and 3 only
(D) 2 and 3 only
▶️Answer/Explanation
Ans: D
Question
Which equation shows the metabolic process used in bread making?
(A) carbon dioxide + water → glucose + oxygen
(B) glucose + oxygen → carbon dioxide + water
(C) glucose → ethanol + carbon dioxide
(D) glucose → lactic acid
▶️Answer/Explanation
Ans : C
Question
What is the catalyst used in the Contact process?
(A) yeast
(B) iron
(C) nickel
(D) vanadium(V) oxide
▶️Answer/Explanation
Ans: D
Question
Which statement about denaturation is correct?
(A) Denaturation is the change in shape of the active site of the enzyme at a pH above the optimum pH.
(B) Denaturation is the change in shape of the active site of the enzyme at a temperature below the optimum temperature.
(C) Denaturation is the change in shape of the active site of the substrate at a pH below the optimum pH.
(D) Denaturation is the change in shape of the active site of the substrate at a temperature above the optimum temperature.
▶️Answer/Explanation
Ans : A