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Week 3, Lecture 1, Cell Cycle

Week 3, Lecture 1, Cell Cycle - Divide and Conquer BIOLOGY...

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1 B I O L O G Y 0 2 3 19-Sep-09 Gardiner 1 Divide and Conquer B I O L O G Y 0 2 3 19-Sep-09 Gardiner 2 Back to the Antibiotic Resistance Model Once a bacterial cell ( prokaryote ) gets past the bodies barriers it may be in the environment to grow Growth of the cell leads to cell divison, and so on Growth of the pathogen (any disease producing microorganism) leads to cellular damage or “worse” in the host organisms 19-Sep-09 Gardiner 3 Number of cells will double with each new generation ( exponential growth ). 1 cell barb2right 2 cells barb2right 4 cells barb2right 8 cells barb2right 1 st Gen 2 nd Gen 3 rd Gen B I O L O G Y 0 2 3 19-Sep-09 Gardiner 4 Wow That’s Fast Growth Rates for some Prokaryotes Escherichia coli 20 minutes Mycobacterium tuberculosis 15-16 hours
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2 B I O L O G Y 0 2 3 19-Sep-09 Gardiner 7 What do all cells require to survive? A complete set of genetic instructions produce required molecules direct life processes Genetic instructions are coded in the DNA of cells B I O L O G Y 0 2 3 19-Sep-09 Gardiner 8 Why do cells divide? Growth Repair Development B I O L O G Y 0 2 3 19-Sep-09 Gardiner 9 Cell Cycle Activities of a cell from one cell division to the next Cell grows, adding more cytoplasmic constituents DNA is replicated Cell divides into two identical daughter cells B I O L O G Y 0 2 3 19-Sep-09 Gardiner 10 Essential Features of Cell Division Transmit a complete copy of genetic information (DNA) Transmit materials necessary for cell to survive and use genetic information B I O L O G Y 0 2 3 19-Sep-09 Gardiner 11 Two Fundamental Types of Cells (organisms): Prokaryotic Eukaryotic B I O L O G Y 0 2 3
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