Biology 0610 · IGCSE · Enzymes

Enzymes — practice question

Quinoa, Chenopodium quinoa, is a dicotyledonous plant whose seeds look similar to those of cereals such as rice.
(a)[1]

State one characteristic found in all dicotyledonous plants.

(b(i))[2]

Define the term gene.

(b(ii))[2]

Describe the differences in structure between the storage protein and the protease shown in Fig. 2.1.

(c)[2]

State the roles of mRNA and ribosomes in protein synthesis.

(d(i))[2]

State two factors other than pH that would affect enzyme activity.

(d(ii))[3]

Describe the effect of increasing pH on the activity of the protease in quinoa seeds.

(d(iii))[4]

Explain the activity of protease at pH 4.0 and at pH 7.0.

Worked solution & mark scheme

This 16-mark question has a full step-by-step worked solution and mark scheme. One marking point: cotyledons, two in number

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