Notes for Exam 3 - February 3 2011 Growth Binary Fission...

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February 3, 2011 Growth Binary Fission Cell Cycle: Going from one cell to two cells G1 Phase: GAP 1 S: Synthase of DNA G2: GAP 2 M: Mitosis Amitosis: Division without a nucleus Cell Division Daughter Cells There is no nucleus in prokaryotes Very slow= 3,000 reactions per second DNA is probably attached to the cell membrane HOW FAST ARE CELL CYCLES? ( Really important when it comes to food.) E coli: main one; 37 degress, it can divide into about one and a half cells in about 12 and a half minutes or 15 minutes Sal. Typhi: 37 degrees, cell cycle in 25 minutes, may be as long as 60 minutes Mycobacterium: cell cycle; 392 minutes-932 minutes (appox. 6 ½ hours to 12 hours) Treponema: cell cycle; 1980 minutes (33 hours) Concentration #cello/ml = 2 (each cell cycle, you double the population) Growth (time) 60 n= ------------------ ---- = 4 Generation time 15 Cells grow and multiply, they don’t know how not to (only grow if the conditions are right however)
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R= Reproduction D= death (when the cells stop growing)
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