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Download Bacteria multiplication - with Bob the bacterium
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Population Change This is Bob Bob is a bacterium He is going to show you how quickly bacteria can multiply. 120 minutes Plot the information below as a graph: 0 minutes 64 Bobs 140 minutes 20 minutes 40 minutes 60 minutes 128 Bobs 160 minutes 80 minutes 100 minutes 512 Bobs 32 Bobs So, why doesn’t Bob take over the world? • LAG PHASE: Growth is slow at first, while the bacteria acclimate to the food and nutrients in their new habitat. • LOG PHASE: Once the metabolic machinery is running, they start multiplying exponentially, doubling in number with every division. • STATIONARY PHASE: As more and more bacteria are competing for dwindling food and nutrients, booming growth stops and the number of bacteria stabilizes. • DEATH PHASE: Toxic waste products build up, food is depleted and the bugs begin to die Extend your graph to represent the stationary phases and the death phase.
