Respiration and Energy Transfer — Biology STD 11 Science — Question
Maharashtra BoardEnglish MediumSTD 11 ScienceBiologyRespiration and Energy Transfer4 Marks
Question
Why is Krebs cycle referred as amphibolic pathway?
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Answer
Respiration is considered as a catabolic process; however, it is not entirely correct in case of Krebs cycle.
Many reactions of Krebs cycle involve oxidation of acetyl CoA to release energy and C02.
However, the breakdown of respiratory substrates provides intermediates like a-ketoglutarate, oxaloacetate are used as precursors for synthesis of fatty acids, glutamic acid and aspartic acid respectively.
Thus, as the same respiratory process acts as catabolic as well as anabolic pathway for synthesis of various intermediate metabolic products, it is called amphibolic pathway.
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