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

(a) Respiration and combustion:-
Respiration-
1. It is a biochemical process.
2. It occurs in the living cells.
3. ATP is generated
4. Enzymes are required
5. It is a biologically-controlled process.

Combustion-
1. It is a physiochemical process.
2. It does not occur in the living cells.
3. ATP is not generated
4. Enzymes are not required
5. It is an uncontrolled process.

(b) Glycolysis and Krebs cycle:-
Glycolysis:-
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.

Krebs cycle:-
1. It is a cyclic pathway.
2. It occurs in the mitochondrial matrix.
3. It occurs in aerobic respiration.
4. It produces 6 NADH₂, 2FADH₂, and 2 ATP molecules on the breakdown of two acetyl-CoA molecules.

(c) Aerobic respiration and fermentation:-
Aerobic respiration:-
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
Fermentation:-
1. Occurs in the absence of oxygen
2. Occurs in the cytoplasm
3. End products are ethyl alcohol and carbon dioxide
4. Incomplete oxidation of the respiratory substrate takes place
5. Only 2 ATP molecules are produced

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