Biology 9700 · AS & A Level · Transport mechanisms

Transport mechanisms — practice question

Sucrose is a disaccharide. Fig. 2.1 illustrates sucrose undergoing breakdown in a reaction with hydrochloric acid.
(a(i))[2]

Name the products A and B formed in the reaction shown in Fig. 2.1.

(a(ii))[1]

Name the bond type that is broken in the reaction shown in Fig. 2.1.

(a(iii))[1]

State the reaction type shown in Fig. 2.1.

(b)[2]

When Benedict’s solution is added to a sucrose solution and heated in a boiling water-bath, the colour does not change. State why there is no colour change.

(c)[4]

Sugar beet plants, $\textit{Beta vulgaris}$, keep sucrose in their roots. Describe and explain how sucrose is moved from the phloem in the leaves of sugar beet to the storage tissues in the root.

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: A is $\alpha$-glucose

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