| Date | May 2010 | Marks available | 1 | Reference code | 10M.1.HL.TZ2.28 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | State | Question number | 28 | Adapted from | N/A |
Question
What is the link reaction in aerobic respiration?
A. Pyruvate is carboxylated, acetyl reacts with coenzyme A, reducing NADH + H+
B. Pyruvate is decarboxylated, acetyl reacts with coenzyme A, forming NADH + H+
C. Pyruvate reacts with coenzyme A, forming NADH + H+
D. Pyruvate is decarboxylated, reacting with coenzyme A, reducing NADH + H+
Markscheme
B
Examiners report
This was not as well answered as expected. Nearly two thirds chose B, which was the correct answer but substantial numbers also chose D, which contained the incorrect statement that NADH is reduced in the link reaction of aerobic respiration. Candidates should be advised always to check carefully whether statements concerning oxidation or reduction are correct.
Syllabus sections
Additional higher level » Topic 8: Metabolism, cell respiration and photosynthesis » 8.2 Cell respiration
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