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Chapter 5 Outline - Chapter 5 Prokaryotic Growth and...

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Chapter 5 Prokaryotic Growth and Nutrition Introduction 5.1 Prokaryotic Reproduction Most Prokaryotes Reproduce by Binary Fission The cell doubles in mass, and the DNA replicates and the two DNA strands separate Cytokinesis is an inward pinching of the cell membrane and cell wall to separate the cell into two genetically identical cells Prokaryotes Reproduce Asexually The generation (or doubling) time is the interval of time between successive binary fissions of a cell or population of cells In pathogens, a shorter doubling time means a shorter incubation period of the disease 5.2 Prokaryotic Growth A Bacterial Growth Curve Illustrates the Dynamics of Growth During the lag phase, no cell division occurs while bacteria adapt to their new environment Exponential growth of the population occurs during the logarithmic (log) phase Human disease symptoms usually develop during the log phase When reproductive and death rates equalize, the population enters the stationary phase The accumulation of waste products and scarcity of resources causes the population to enter the decline (exponential death) phase Endospores Are a Response to Nutrient Limitation
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