STPM Biology - chapter 5 (old syllabus) chapter 5 (new syllabus): Revision essay question 10

10. The diagram represents some of the biochemical reactions of aerobic respirations.

Study the diagram, and then answer the question which follows.

a) Although oxygen is not mentioned, state how the diagram indicates that aerobic respiration is occurring, rather than anaerobic respiration.

Process of breaking down of glucose into pyruvate which is known as Glycolysis and Krebs Cycle is occurred from the diagram. There are 3 process of anaerobic respiration, such glycolysis, krebs cycle and electron transport chain.

b) Which reaction, represented by a numbered arrow, indicates that a molecule of carbon dioxide is released at that point?

Oxidation occurred when Isocitrate loses a Carbon Dioxide. Number 6.

c) i) At what numbered stage is ATP used?

3

ii) Why is ATP need at this stage?

To breakdown glucose into pyruvate, as pyruvate is use in Krebs Cycle.

d) Which numbered stage represents a coenzyme being released for recycling?

7

e) Which numbered stage represents the point at which a respiratory substrate enters the mitochondrion?

5

f) What type of enzyme would be necessary at stage 6?

Aconitase

g) What happens immediately to the removed 2H?

Dehydrogenation occurred. NAD will convert into NADH+H.

h) Where precisely would you expect to find acetyl CoA in a cell?

Matrix of Mitochondria