Biology 9700 · AS & A Level · Respiration

Respiration — practice question

In the early stages of respiration, 1 molecule of glucose is converted into 2 molecules of a 3C compound.
(a(i))[1]

State the name used for these early stages.

(a(ii))[1]

State the part of the cell where these stages happen.

(a(iii))[1]

State the total number of ATP molecules formed during these stages.

(b(i))[1]

State the location, within the mitochondrion, where oxidative phosphorylation occurs.

(b(ii))[5]

Outline how oxidative phosphorylation works.

(c(i))[1]

Using Table 7.1, identify the two organelles that are not involved in respiration.

(c(ii))[3]

Explain why carbon dioxide is released when mitochondria are incubated with pyruvate, but not when they are incubated with glucose.

(c(iii))[3]

Explain why, in the presence of cyanide, lactate is produced but carbon dioxide is not.

(ii)[3]

Explain why carbon dioxide is released when mitochondria are incubated with pyruvate, but not when they are incubated with glucose.

(iii)[3]

Explain why, in the presence of cyanide, lactate is produced but carbon dioxide is not.

Worked solution & mark scheme

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