Biology 9-1 0970: Enzymes Topical Past Paper Questions

Enzymes are biological catalysts. (a) Describe what is meant by the term catalyst. (b) A student investigated the effect of temperature on enzyme activity. A starch suspension was kept at $ 0^{\circ} $C. Amylase solution was added to the starch suspension. Samples of the starch a…

(a) Fig. 3.1 is a photograph of a cross-section of a persimmon fruit. magnification $ \times $2.2 Fig. 3.1 (i) Draw a large diagram of the persimmon fruit shown in Fig. 3.1. (ii) Line PQ on Fig. 3.1 represents the diameter of the persimmon fruit. Measure the length of line PQ on…

Some animals live in cold places. They sometimes huddle together as shown in Fig. 1.1. Fig. 1.1 A student investigated the effect of humdling on heat loss from model animals. Test-tubes containing hot water represented the animals. The student used the method described in step 1…