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GATE 2019 BT – Question 50

Fundamentals of Biological Engineering · Bioreaction Engineering: Batch, fed-batch and continuous processes, microbial and enzyme reactors, optimization and scale up · 2 marks · Multiple choice

Which influence the lag phase of a batch microbial culture? P inoculum size; Q inoculum age; R medium composition.

  1. P and Q only
  2. Q and R only
  3. P and R only
  4. P, Q and R

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Correct answer: (D) P, Q and R

Explanation

Lag includes adaptation before sustained growth. Its observed duration depends on physiological condition and age of the inoculum, the inoculated population, and how much adaptation the new medium requires. All three listed factors can matter, so D.

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