If the culture is kept in stationary phase for a prolonged period, the cells may die. Why?

a) due to the time taken for doubling of cell number

b) duration of a cell generation is too large, depending mainly on the plant species.

c) stationary phase is forced on the culture by a depletion of the nutrients

d) due to an accumulation of cellular wastes

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#Question id: 14257

#SCPH05 I Biotechnology

The kLa of a small bubble column (2 l) has been measured as 20 h-1 at an airflow of 4 l/m in. If the rate of oxygen uptake by a culture of Catharanthus roseus is 0.2 mmol O2/g dry weight-h and if the critical oxygen concentration must be above 10% of saturation (about 8 mg/l), what is the maximum concentration of cells that can be maintained in the reactor?

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#Question id: 1593

#SCPH05 I Biotechnology

Which of the following results in long-term immunity?

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#Question id: 9257

#SCPH28 | Zoology

Which lake zone would be absent in a very shallow lake?

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#Question id: 1631

#I Life Science/ Life Sciences Group – I-V

Specific antibodies are readily detectable in serum following primary contact with antigen after:

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#Question id: 10713

#SCPH28 | Zoology

Following is sampling data of five species in five quadrate is represent. Which of the following is a correct order of decreasing abundance?