Lag phase

Definition

The lag phase is the initial period of microbial growth where cells adapt to their new environment before starting to divide. During this phase, there is little to no increase in cell number.

5 Must Know Facts For Your Next Test

1. During the lag phase, cells are metabolically active but not dividing.
2. The duration of the lag phase can vary depending on factors such as nutrient availability and environmental conditions.
3. Cells may produce enzymes and other molecules necessary for subsequent growth during the lag phase.
4. This phase serves as a preparation period for exponential (log) growth.
5. Lag phase can be influenced by the history of the inoculum, such as its age or previous growth conditions.

Review Questions

• What metabolic activities occur during the lag phase?
• How does nutrient availability affect the duration of the lag phase?
• Why is there little to no increase in cell number during the lag phase?

Related terms

Exponential Phase:

A period where cells divide at a constant and rapid rate, leading to an exponential increase in population.

Stationary Phase:

A stage in microbial growth where the rate of cell division equals the rate of cell death due to depletion of nutrients.

Death Phase:

The final stage where cells die at an accelerated rate due to unfavorable conditions.