Question

Differentiate between:
(a) Respiration and Combustion
(b) Glycolysis and Krebs’ cycle
(c) Aerobic respiration and Fermentation

Answer 1

(a) Respiration and combustion

Respiration	Combustion

1. | It is a biochemical process.| 1. | It is a physiochemical process.
   2.| It occurs in the living cells.| 2.| It does not occur in the living cells.
   3.| ATP is generated| 3.| ATP is not generated.
2. | Enzymes are required| 4. | Enzymes are not required.
   5.| It is a biologically controlled process. | 5.| It is an uncontrolled process.

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(b) Glycolysis and Krebs cycle

Glycolysis	Krebs cycle
1.	It is a linear pathway.
2.	It occurs in the cell cytoplasm.
3.	It occurs in both aerobic and anaerobic respiration.
4.	It generates 2 NADH2 and 2 ATP molecules on the breakdown of one glucose molecule.

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(c) Aerobic respiration and fermentation

Aerobic respiration	Fermentation
1.	Oxygen is used for deriving energy
2.	Occurs in the cytoplasm and mitochondria
3.	End products are carbon dioxide and water
4.	Complete oxidation of the respiratory substrate takes place
5.	About 36 ATP molecules are produced