Summative Practice (Question 3) – Form 5 Science (KSSM) Chapter 4


Question 3:
Digestive enzymes function as biological catalysts to change the rate of decomposition of complex food molecules into simpler molecules in the digestive system. What is the use of digestive enzymes other than aiding in the digestion of food? Figure 2 shows one application of biological catalysts in daily life.


(a) Give two examples of biological catalyst in the washing powder.

(b) What is the effect of the biological catalyst towards food stains on clothes?

(c) State one factor that influences the effectiveness of the biological catalyst in the reaction.

(d) How does this factor influence the action of the biological catalyst?


Answer:
(a) Protease, lipase

(b)
Protease increases the rate of decomposition of protein molecules to amino acid. Lipase increases the rate of decomposition of fat molecules to fatty acid and glycerol.

(c) Temperature

(d)
Biological catalyst functions best at a temperature of 40°C.

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