Biology 9700 · AS & A Level · Respiration

Respiration — practice question

Fig. 6.1 shows some of the stages in glycolysis.
(a(i))[1]

State where, exactly, glycolysis happens in the cell.

(a(ii))[3]

With reference to Fig. 6.1: state the steps at which phosphorylation happens; state the step at which oxidation happens; name the reaction type that forms ATP in step 5.

(b)[2]

Some cancer cells have metabolic needs that differ from those of normal cells. These cancer cells derive most of their ATP from glycolysis, even when oxygen is present. State how the glucose and oxygen requirements of these cancer cells compare with normal cells.

Worked solution & mark scheme

This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: Glycolysis takes place in the cytoplasm

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