sigmoid growth curve is observed in ____ culture of bacteria.
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Answer:
A
Lag, Log, Stationary, Decline phase
Four characteristic phases of the growth cycle are:
1. Lag phase- immediately after inoculation of the cells into fresh medium, where the synthesis of enzymes, proteins, RNA takes place.
2. Exponential (log) phase- where all the cells are dividing regularly by binary fission and are growing by geometric progression. The cells divide at a constant rate depending upon the composition of the growth medium and the conditions of incubation.
3. Stationary phase- exponential growth cannot be continued forever in a culture. Population growth is limited by one of three factors: exhaustion of available nutrients; accumulation of inhibitory metabolites or end products; exhaustion of space, (called a lack of biological space).
4. Death phase- if incubation continues after the population reaches stationary phase, a death phase follows, in which the viable cell population declines.
Explanation: