1.

Kreb’s cycle was discovered by Krebs in pigeon muscles in 1940. Which step is called gateway step/link reaction/transition reaction in respiration? (a) Glycolysis (b) Formation of acetyl Co-A (c) Citric acid formation (d) ETS terminal oxidation

Answer»

Correct option is (b) Formation of acetyl Co-A

If O2 is not available, pyruvic acid undergoes anaerobic respiration / fermentation, but under aerobic condition, the pyruvic acid enters into mitochondria and converted to acetyl Co-A. Acetyl Co-A functions as substrate entrant for Krebs’ cycle. So, it is a connecting link between glycolysis and Kreb’s cycle.



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