Biology 9700 · AS & A Level · Respiration

Respiration — practice question

The Krebs cycle takes place in the matrix of the mitochondrion. Fig. 6.1 presents the steps in the Krebs cycle.
(a(i))[1]

Using Fig. 6.1, name the process that occurs at 1 and 3.

(a(ii))[1]

Using Fig. 6.1, name the process occurring at 2, 4, 6 and 7.

(a(iii))[1]

Using Fig. 6.1, name the process occurring at 5.

(b)[2]

State the identities of compounds K and L.

(c)[5]

Most of the hydrogen atoms released in the Krebs cycle take part in oxidative phosphorylation on the cristae of the mitochondria. Outline oxidative phosphorylation.

Worked solution & mark scheme

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