Biology 9700 · AS & A Level · Respiration

Respiration — practice question

Respiration is a process that leads to ATP synthesis. The ATP may then be used inside the cell for reactions and processes that require energy. Aerobic respiration has four stages: glycolysis, the link reaction, the Krebs cycle and oxidative phosphorylation.
(a)[1]

ATP made during respiration can be used to build larger, more complex biological molecules from smaller molecules. Name the type of reaction that takes place when smaller molecules are joined to form larger, more complex biological molecules.

(b)[2]

ATP is used in the first part of glycolysis. Explain why ATP is required in the first part of glycolysis.

(c)[1]

State the exact locations of substrate-linked phosphorylation reactions in aerobic respiration.

(d)[2]

Explain what happens to pyruvate during the link reaction in aerobic respiration.

(e)[3]

Chemiosmosis takes place in mitochondria during aerobic respiration and in chloroplasts during photosynthesis. Describe how chemiosmosis in mitochondria differs from chemiosmosis in chloroplasts.

Worked solution & mark scheme

This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: anabolic, condensation or polymerisation

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