Multiple choice

Which of the following is/are examples of the amphibolic cycle?

  1. TCA cycle
  2. Calvin cycle
  3. Hatch slack cycle

  1. Only1

  2. Only 2

  3. Only 3

  4. Only 1 and 2

  5. Only 2 and 3
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A Correct answer
Explanation

The term amphibolic is used to describe a biochemical pathway that involves both catabolism and anabolism. The Tricarboxylic acid cycle (TCA cycle or Krebs Cycle) is a good example of the amphibolic pathway. The first reaction of the cycle, in which oxaloacetate (a four carbon compound) condenses with acetate (a two carbon compound) to form citrate (a six carbon compound) is typically anabolic. The next few reactions, which are intramolecular rearrangements, produce isocitrate. The following two reactions are typically catabolic. CO2 is lost in each step and succinate (a four carbon compound) is produced.

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