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Question

Fat has two components, glycerol and fatty acids. They enter common pathway of respiration as


A
DiHAP and α-ketoglutarate
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B
DiHAP and acetyle CoA
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C
Glyceric acid and acetyl CoA
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D
Glyceric acid and α-ketoglutarate
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Solution

The correct option is B DiHAP and acetyle CoA
When fats are the respiratory substrates, they are first converted to fatty acids and glycerol in the presence of enzyme lipase. Glycerol is phosphorylated to glycerol-3-phosphate in the presence of enzyme glycerol kinase.

Glycerol + ATP → Glycerol-3-phosphate + ADP

Glycerol-3-phosphate is then converted to dihydroxyacetone phosphate  by enzyme glycerol phosphate dehydrogenase  which enters into glycolysis. 

Glycerol-3-phosphate + NAD+ → Dihydroxyacetone phosphate + NADH + H+

The fatty acids are converted to acetyl coenzyme A by beta oxidation. The acetyl coenzyme A enters into Krebs cycle and oxidised to carbon dioxide and water. 

Thus, the correct answer is option B. 


Biology

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