GATE ES Growth and control of microorganisms PYQs & Answers

Questions 1–6 of 6. Imported answers require independent review unless marked reviewed.

In a batch culture experiment, 2 cells of a microorganism were added to a growth medium. During the experiment, a lag phase of 1 hour was first experienced by the added cells, in which no cell multiplication occurred. Afterwards, cells started multiplying exponentially with a doubling time of 1 hour. After total 8 hours of experiment, the number of cells present in the growth medium was ______ (answer in integer).

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If microbial growth occurs under substrate unlimited conditions, according to Monod’s kinetics, choose the correct option(s) from the following

Your answerSelect all correct options. You can choose more than one.

Microbial growth follows zero order with respect to substrate concentration.

Microbial growth follows first order with respect to substrate concentration.

Specific growth rate is half of maximum specific growth rate.

Specific growth rate is almost equal to maximum specific growth rate.

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With reference to disinfection, which of the following statement(s) is/are CORRECT?

Your answerSelect all correct options. You can choose more than one.

Ethanol damages lipid structures in the bacterial cell membrane.

Mercuric chloride inactivates cellular enzymes containing sulfhydryl groups.

Glutaraldehyde inactivates protein.

Isopropyl alcohol cannot be used as a disinfectant.

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For an exponentially growing microbial culture, the specific growth rate (μ) is related to its doubling time (t

) by which one of the following relations?

Your answerChoose one option.

= μ

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A microbial culture, with a specific growth rate of μ

(per hour), is being grown in a continuous reactor at steady state with hydraulic retention time (HRT) of 24 hours. This reactor is subjected to a perturbation by reducing the HRT to 12 hours. The reactor recovers from the perturbation and comes to a new steady state with a new specific growth rate of μ

(per hour). Which one of the following statements is correct?

Your answerChoose one option.

= μ

= 0.5 μ

= e

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In a sample, the growth of microbial cells started with an initial concentration of 5×10⁴ cells per millilitre (mL) of the sample. After a certain time period, the cell concentration was found to be 1280×10⁴ cells per mL of the sample. Assuming binary fission of cells and no cell death, the number of generations of cell growth occurred in this time period is __________ (answer in integer).

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GATE ES Growth and control of microorganisms PYQs

How to practice Growth and control of microorganisms

Question 53

Question 44

Question 44

Question 38

Question 39

Question 24