Bio 100 - Cell basic unit of all cellular life The smallest unit of life Cells are physically separated from each other Cells are effectively

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Cell: basic unit of all cellular life. The smallest unit of life. Cells are physically separated from each other. Cells are effectively isolated from the outside environment by a cell membrane and in some cases a cell wall . Cell is small The small size of cells is a function of surface area to volume ratio. Nutrients enter and wastes exit across the cell membrane Increased surface area permits increased rate of exchange As cell volume increase, demand for nutrients increases, but surface area does not increase proportionately. Two types of cells -Prokaryote cell: occur in 2 Domains- Domain Bacteria, Domain Archaea -Eukaryotes cell: organism in domain Eukarya- includes those of protista, fungi, animals, and plants. Most eukaryotic cells are larger than prokaryotic cells Prokaryote cell Eukaryotes cell A plasma membrane that surrounds and delineates the cell A cytoplasm that is the semi-fluid portion inside the cell that contains organelles DNA Simple shapes: round, rod, spiral Lacking a nucleus and other organelles The simplest and most ancient forms of life A complex cell containing membrane : Cell wall more complex than bacteria - bounded organelles Having a nucleus and other organelles Found in extreme environments: - High temperature (above boiling point) - High pressure (in deep ocean) - High salt (in salt lake) Microbiology -Microbiology: study of microorganisms (or microbes) - Microorganisms (or microbes): organisms and agents too small to be clearly seen by the unaided eye.
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Include bacteria, Achaea, protozoa, algae, fungi and viruses Relationship to humans - Pathogens: Disease-causing microbes E.g. Streptococcus - “Strep Throat” Influenza virus - “Flu” -Normal flora: Microbes found in/on healthy individuals e.g. E. coli – in intestine, Staphylococcus – on skin Impact on Humans -Food: harmful and beneficial Harmful: Food-borne illness: food “poisoning” Beneficial: Dairy products: cheese, yogurt Fermented foods: pickles, sauerkraut Alcoholic beverages: beer, wine Baked goods: bread Through microscope, we can see Atoms/ Small molecules/ Proteins/ Viruses/ Most bacteria/ most plant and animal cells/ Frog eggs/ Ant Range of scanning probe microscope- small molecules, proteins, viruses, most bacteria Range of electron microscope- proteins, viruses, most plant and animal cells Range of light microscope- most bacteria, most plant and animal cells, frog eggs. Range of human eye – frog eggs, ant
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This note was uploaded on 02/19/2011 for the course BIO 100 taught by Professor S.sanchez during the Spring '10 term at Orange Coast College.

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Bio 100 - Cell basic unit of all cellular life The smallest unit of life Cells are physically separated from each other Cells are effectively

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