5.1 - Test mistakes

Question 1

Describe what happens to pyruvate when the muscle is supplied with oxygen.

Answer 1

Transported into mitochondria
Link reaction oxidises pyruvate to form reduced NADH
Carbon dioxide is removed
Molecule combines with coenzyme A

Question 2

Suggest what would happen in the Krebs cycle if acetyl CoA became unavailable.

Answer 2

Cycle would stop
4 Carbon compound would accumulate
6 carbon compound would not be synthesised

Question 3

Explain why the respiration of lipids generates more ATP than the respiration of carbohydrates.

Answer 3

A lipid molecules contains a higher proportion of hydrogen
More reduced NAD and FAD
Therefore more hydrogen ions accumulate in the inter-membrane space to pass through ATP synthase