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Transcript of cell intro
take in nutrients?
give off waste?
respond to stimuli?
All organisms are made up of cells Cells are made up of organelles
="tiny" organs Nucleus:
brain of the cell
contains the DNA Cell Wall:
is only in plants and bacteria,
provides support and structure Cell membrane:
controls what goes in and out of the cell
fluid mosaic of phospholipids bilayers and protein gates http://www.brainpop.com/science/cellularlifeandgenetics/ http://www.brainpop.com/science/cellularlifeandgenetics/activetransport/preview.weml http://www.brainpop.com/science/cellularlifeandgenetics/cells/preview.weml Cytoplasm:
gell like liquid that the organelles are in Endoplasmic Reticulum:
rough ER (has ribosomes on it)
the passageways that materials are trasnported around the cell on Golgi Body:
packages materials that are used by the cell Vacuole
*large in the plant cell where it provides support
*stores water and food Vesicle
*stores water food and waste
*lysosome are specific name for waste storing vesicles ribosomes
make proteins Mitochondria
where respiration occurs producing energy in the cell in the form of ATP Chloroplasts
*only in plants
*where photosynthesis occurs Mitosis Meiosis cell division= producing two exact copies *cell division in gametes (eggs, sperm, pollen, ovum)
*produce four cells with half the DNA. Microbiology:
*what does micro mean?
*ology The study of little things like:
classified by shape: Spherical
like Streptococcus and Staphlyococcus Rod-shaped
like E.coli Spiral shaped
like spirillum How big are protists, bacteria and viruses? *protists are tiny
*bacteria are really really tiny
*viruses are WAY more tiny than either one! How do cells get nutrient in and waste out? Diffusion
*the movement of molecules from an area of high concentration to an area of low concentration Osmosis
*the diffusion of WATER across a membrane Passive Transport
*doesn't need energy=diffusion Active Transport
*movement of molecules from low to high concentration
*doesn't happen on its own
*require energy (ATP) http://www.williamsclass.com/SeventhScienceWork/ImagesCellBricks/Diffusion.gif http://people.eku.edu/ritchisong/osmosis3.gif *movement of molecules across the membrane that are too big to fit through the protein gates.
*super duper small
*not made of cell so not even considered living
*simply a protein capsule containing DNA
*cannot reproduce on their own roles of bacteria
1.cause infections, killed with antibiotics
3.in our food
*bad- spoiled milk, cook meat, e.coli contamination
*insulin producing bacteria reproduce with the lytic cycle cause desease: combat with vaccines (dead or weakened versions of the virus so your body makes antibodies to it) http://www.cellsalive.com/howbig.htm Protists are the largest group in microbiology...and the most complex...and diverse Protists:
found everywhere, common in water
have specialized structures for moving, which is what they are classified by Paramecium:
beat cilia- little hairs all over their bodies Euglena
flagella- tail Ameoba
oozing pseudopods (fake feet), also known as cytoplasmic ooze Volvox:
very important! because they are a colony of single celled protists
they are the evolutionary connection between single celled and multicellular organisms The END Respiration:
occurs in the mitochondria
the chemical reaction between sugar and oxygen--> water and carbon dioxide and energy in the form of ATP Photosynthesis
occurs in the chloroplasts
CO2 + H2O +sunlight--> O2 + C6H12O2