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GATE 2019 BT – Question 27

Fundamentals of Biological Engineering · Bioreaction Engineering: Kinetics of cell growth, substrate utilization and product formation, structured and unstructured models · 1 mark · Multiple choice

What is catabolized during endogenous metabolism in batch bacterial cultivation?

  1. Internal reserves
  2. Extracellular substrates
  3. Extracellular products
  4. Toxic substrates

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Correct answer: (A) Internal reserves

Explanation

When external nutrients are exhausted, cells can oxidize stored compounds and cellular material to meet maintenance requirements. This use of internal reserves is endogenous metabolism, A. Uptake of fresh extracellular substrate is ordinary exogenous feeding rather than the process named.

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