Biology 0610 · IGCSE · Enzymes

Enzymes — practice question

Pectinase is an enzyme used to obtain juice from fruits such as apples. Fig. 5.1 shows how the volume of juice obtained from two samples of crushed apple of equal size changes over 16 minutes. Sample A included pectinase, whereas Sample B had the same volume of water.
(a(i))[1]

How much juice had been obtained from the apples in Sample A after 2 minutes?

(a(ii))[1]

How much extra time does Sample B need to make this amount of juice? Show your working.

(a(iii))[2]

State two benefits to the food industry of using pectinase in juice extraction.

(b(i))[2]

Define what is meant by anaerobic respiration.

(b(ii))[1]

Besides alcohol production, the anaerobic respiration of yeast can also be used to make other useful products. State the name of one such product.

(b(iii))[2]

Yeast can also carry out aerobic respiration. State two differences between aerobic respiration and anaerobic respiration in yeast.

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