BRAINCAKEGrowth of Bacterial Colonies
When bacteria are put into fresh nutrient broth in a closed culture (no nutrients added and no waste removed), the population follows a typical growth curve with four phases.
1. Lag phase. The number of cells hardly increases. The bacteria are adjusting to the new conditions: taking up water, and synthesising the enzymes and other molecules needed to use the nutrients available.
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Key terms in this lesson
- binary fission
- Asexual reproduction in bacteria in which one cell divides into two genetically identical daughter cells.
- generation time
- The time taken for a population of cells to double in number under given conditions.
More in Bacteria and Disease
- Counting the Number of Cells
- Turbidity
- Dilution Plating
- Area and Mass of Fungi
- Logarithmic Scale
- Exponential Growth
- Bacterial Toxins
- Endotoxins
All 30 lessons in Bacteria and Disease · All Edexcel A-level Biology topics