Biology 9700 · AS & A Level · Respiration

Respiration — practice question

Glycolysis is a metabolic pathway that takes place in the cytoplasm of cells. During glycolysis, one glucose molecule is converted into two pyruvate molecules. Fig. 1.1 shows the sequence of events.
(a(i))[1]

Explain why glucose is phosphorylated at the start of glycolysis.

(a(ii))[1]

Suggest one use of the reduced NAD made in glycolysis.

(a(iii))[1]

Name the type of phosphorylation reaction that produces ATP during glycolysis.

(b)[3]

Pyruvate can enter the mitochondrion by active transport. Describe the main conditions needed for pyruvate to enter the mitochondrion by active transport.

(c)[3]

Pyruvate is involved in the link reaction in the matrix of the mitochondrion. Describe the link reaction.

Worked solution & mark scheme

This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: glucose is activated / made reactive

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