Week 3, Lecture 1, Cell Cycle

Week 3 Lecture 1, - Divide and Conquer BIOLOGY 023 Wow Thats Fast BIOLOGY Growth Rates for some Prokaryotes Escherichia coli Mycobacterium

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1 B I O L O G Y 0 2 3 19-Sep-09 Gardiner 1 Divide and Conquer 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 b 2 cells b 4 cells b 8 cells b 1 st Gen 2 nd Gen 3 rd Gen 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 19-Sep-09 Gardiner 8 Why do cells divide? Growth Repair Development 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 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 19-Sep-09 Gardiner 11 Two Fundamental Types of Cells (organisms): Prokaryotic Eukaryotic 19-Sep-09 Gardiner 12 Prokaryotic Cell no nucleus – genetic material (DNA) in cytoplasm no membrane-bound organelles example: bacteria cell division is called
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This note was uploaded on 04/18/2010 for the course BIOLOGY 1223 taught by Professor Gardiner/lajoie during the Spring '09 term at UWO.

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Week 3 Lecture 1, - Divide and Conquer BIOLOGY 023 Wow Thats Fast BIOLOGY Growth Rates for some Prokaryotes Escherichia coli Mycobacterium

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