Enzymes (Cambridge (CIE) IGCSE Combined Science: Biology): Exam Questions

Exam code: 0653

4 mins1 question
1
4 marks

Fig. 3.2 shows the effect of pH on enzyme activity.

Graph showing enzyme activity versus pH, forming a bell-shaped curve that peaks at about pH 7 and decreases towards low and high pH values.

Fig. 3.2

(i) The enzyme in Fig. 3.2 is active in the mouth.

When the enzyme reaches the stomach, the enzyme activity changes.

Explain why the enzyme activity changes.

[3]

(ii) Draw a curve on Fig. 3.2 to show the activity of a protease enzyme found in the stomach.

[1]