| Date | May 2010 | Marks available | 1 | Reference code | 10M.3.SL.TZ1.11 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 1 |
| Command term | State | Question number | 11 | Adapted from | N/A |
Question
The diagram below shows part of the respiratory pathway. The number of carbon atoms in each molecule is indicated.
Label pyruvate and acetyl coenzyme A on the diagram above.
[1]
a (i).
Indicate two places where decarboxylation occurs on the diagram.
[1]
a (ii).
List one product other than carbon dioxide formed in this stage of respiration.
[1]
a (iii).
State precisely where in a cell this stage of respiration is occurring.
[1]
b.
Markscheme
(i) and (ii)
a (i).
(i) and (ii)
a (ii).
NADH + H+ /FADH2 /ATP (or GTP)
a (iii).
matrix of mitochondrion
b.
Examiners report
The majority were able to gain three marks from the parts of this question.
a (i).
The majority were able to gain three marks from the parts of this question.
a (ii).
The majority were able to gain three marks from the parts of this question.
a (iii).
As the question asked, candidates need to be precise in their answers, and many simply gave “mitochondria“ as their answer instead of specifying “matrix”.
b.
Syllabus sections
Additional higher level » Topic 8: Metabolism, cell respiration and photosynthesis » 8.2 Cell respiration
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