Question

When carbon is a limiting factor, many organisms will skip which steps in the Tricarboxylic Acid Cycle?

A. the steps liberating CO2

B. the hydrolysis steps

C. the formation of GTP

D. the loss of CoA

E. all steps producing NADH

Answer 1

Answer:     E. All steps producing the NADH

because the conversion of isocitrate to alpha-keto glutarate and alpha-keto glutarate to succinyl-CoA requires loss of CO₂, When carbon is a limiting factor, many organisms will skip these steps in the Tricarboxylic Acid Cycle (TCA cycle or Citric acid cycle OR krebs cycle) and reserved as intermediate compounds in TCA cycle as shown in below figure.

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