Science Combined 0653: B4. Enzymes Topical Past Paper Questions
Cambridge IGCSE Science Combined (0653) past-paper questions on B4. Enzymes, free. This topic is frequently examined across 26 exam sessions. Sign in for the full topic-segregated question bank and AI worksheets.
Sample questions
A student investigates the relationship between substrate concentration and the rate of an enzyme-controlled reaction. Catalase is an enzyme found in yeast cells. It catalyses the breakdown of the substrate hydrogen peroxide, releasing thermal energy (heat). The student compares…
A student investigates an enzyme-controlled reaction. Catalase is an enzyme found inside potato cells. It catalyses the breakdown of hydrogen peroxide, releasing oxygen gas. When potato is mixed with aqueous hydrogen peroxide in a boiling tube, oxygen gas produces a foam. The hei…
(a) Fig. 1.1 shows part of the human alimentary canal and associated organs. Fig. 1.1 (i) On Fig. 1.1, draw a line and the letter L to label the liver. [1] (ii) State the name of the part labelled X shown on Fig. 1.1. [1] (b) Mechanical digestion takes place in the alimentary can…
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