Biology 9700 · AS & A Level · Respiration

Respiration — practice question

The findings from investigations on mitochondria demonstrate how the mitochondrion’s structure is linked to its function in aerobic respiration.
(a(i))[2]

Suggest and explain why the inner membrane of a mitochondrion stays intact when the organelle is placed in pure water.

(a(ii))[3]

Name three molecules, apart from coenzymes, that are present in the mitochondrial matrix and explain their role in aerobic respiration.

(a(iii))[1]

Suggest why the inner membrane contains a very high proportion of the molecule cardiolipin.

(b(i))[4]

Explain how hydrogen atoms from reduced NAD and reduced FAD cause a membrane potential to form across the inner mitochondrial membrane during oxidative phosphorylation.

(b(ii))[2]

Suggest and explain how $P_i$ is transported across the inner membrane of the mitochondrion into the matrix.

(b(iii))[2]

Suggest the advantages of linking ATP transport to ADP transport across the inner membrane of the mitochondrion.

(ii)[2]

Suggest and explain how $P_i$ is transported across the inner membrane of the mitochondrion into the matrix.

(iii)[2]

Suggest the advantages of linking ATP transport to ADP transport across the inner membrane of the mitochondrion.

Worked solution & mark scheme

This 18-mark question has a full step-by-step worked solution and mark scheme. One marking point: folds in the cristae let the inner membrane expand

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