Biology 9700 · AS & A Level · Respiration

Respiration — practice question

In glycolysis, glucose is broken down through a sequence of reactions to produce two pyruvate molecules. Fig. 6.1 presents glycolysis.
(a(i))[1]

Using Fig. 6.1, state the process occurring at steps 1 and 2.

(a(ii))[1]

Using Fig. 6.1, state the process occurring at step 3.

(a(iii))[1]

Using Fig. 6.1, state the process occurring at step 4.

(b)[2]

Explain why glucose needs to be converted to hexose bisphosphate.

(c)[4]

Pyruvate can enter a mitochondrion when oxygen is present. Describe what happens to pyruvate in a yeast cell when oxygen is absent.

Worked solution & mark scheme

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