bgrowth - C. Average 15 - 20 min. (varies - 10 minutes to...

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BACTERIAL REPRODUCTION AND GROWTH BACTERIAL REPRODUCTION A. Occurs by binary fission (simple division) B. Asexual C. Process (see fig. in text): 1. Slight enlargement in cell size due to : a. Increase in metabolic activities b. Production of energy and cell parts 2. DNA replicates (duplicated) 3. Cell wall and membrane grow inward separating DNA molecules 4. Transverse septum (wall, cross wall) is formed a. Due to continued growth of cell wall and membrane b. Divides contents of cell and DNA molecules 5. Two daughter cells formed GENERATION TIME A. Time required for one cell to produce two new cells. B. Varies with type organism and environmental conditions.
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Unformatted text preview: C. Average 15 - 20 min. (varies - 10 minutes to 24 hrs.) BACTERIAL GROWTH A. Increase in numbers (size of population) B. Constantly doubles - increases exponentially C. Expressed as logarithmic function of base 2 x 1. Population doubles - 2 2. X - # times population doubles D. 1 cell reproducing every 20 min. over 1 million cells in 7 hours 1 billion in 10 hrs. in 24 hrs. number followed by 2I zeros. . MEASUREMENT OF BACTERIAL GROWTH A. Methods of measurement : 1. Optical density 2. Plate count 3. Direct microscopic count...
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bgrowth - C. Average 15 - 20 min. (varies - 10 minutes to...

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