Question 1: Differentiate between
(a) Respiration and Combustion
(b) Glycolysis and Krebs cycle
(c) Aerobic respiration and Fermentation
Answer:
(a) Respiration and combustion
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Respiration
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Combustion
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1.
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It is a biochemical process.
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1.
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It is a physicochemical process.
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2.
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It occurs in the living cells.
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2.
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It does not occur in the living cells.
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3.
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ATP is generated
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3.
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ATP is not generated
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4.
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Enzymes are required
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4.
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Enzymes are not required
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5.
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It is a biologically-controlled process.
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5.
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It is an uncontrolled process.
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(b) Glycolysis and Krebs cycle
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Glycolysis
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Krebs cycle
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1.
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It is a linear pathway.
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1.
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It is a cyclic pathway.
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2.
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It occurs in the cell cytoplasm.
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2.
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It occurs in the mitochondrial matrix.
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3.
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It occurs in both aerobic as well as anaerobic respiration.
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3.
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It occurs in aerobic respiration only.
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4.
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Net Generation of 2 NADH+H+ and 2 ATP molecules occurs on the breakdown of one glucose molecule.
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4.
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It produces 6 NADH+H+, 2FADH2, and 2 ATP molecules on the breakdown of two acetyl-CoA molecules generated after glycolysis of one glucose molecule.
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(c) Aerobic respiration and fermentation
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Aerobic respiration
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Fermentation
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1.
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Oxygen is used for deriving energy
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1.
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Occurs in the absence of oxygen
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2.
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Occurs in the cytoplasm and mitochondria
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2.
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Occurs in the cytoplasm
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3.
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End products are carbon dioxide and water
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3.
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End products are ethyl alcohol and carbon dioxide
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4.
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Complete oxidation of the respiratory substrate takes place
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4.
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Incomplete oxidation of the respiratory substrate takes place
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5.
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About 36 ATP molecules are produced
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5.
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Only 2 ATP molecules are produced
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Comments
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