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The total rate of oxygen uptake is proportional to the concentration of __________

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The total rate of oxygen uptake is proportional to the concentration of __________

(a) Medium

(b) Liquid

(c) Number of cells

(d) Gas

The question was asked in an interview for job.

My enquiry is from Role of Diffusion in Bioprocessing in portion Mass Transfer of Bioprocess Engineering

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Right option is (c) Number of cells

For explanation: The concentration of cell increases during course of batch culture and the total rate of oxygen uptake is proportional to the no. of cell present. The rate of oxygen consumption per cell also known as oxygen uptake rate (OUR):

Qo = qox

Where: Qo = oxygen uptake rate per volume broth (gL^-1 s^-1)

qo = specific oxygen transfer rate (gg^-1 s^-1).

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