prokaryotes vs eukaryotes n.
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Prokaryotes vs. Eukaryotes. Prokaryotes: * NO NUCLEUS, but do have nucleiod region with DNA present *Small and Simple – few organelles *Have cell membranes and cytoplasm Ex. Bacteria Eukaryotes: *Contain nuclei

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Prokaryotes vs. Eukaryotes


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prokaryotes vs eukaryotes
Prokaryotes vs. Eukaryotes
  • Prokaryotes: *NO NUCLEUS, but do have nucleiod region with DNA present

*Small and Simple – few organelles

*Have cell membranes and cytoplasm

Ex. Bacteria

  • Eukaryotes: *Contain nuclei

*Contains organelles that perform specialized functions

*Uni-or multicellular

Ex. Plant and animal cells

basic cell parts cell membrane and cytoplasm
Basic cell parts: cell membrane and cytoplasm
  • Cell membrane –

*provides barrier between internal and external environment of cell

*is semi-permeable (some things can go in, some cannot; some things can exit, some never can)

*made up of phospholipid bilayer with proteins embedded that allow for needed passage of large molecules

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Major job of cell membrane is to maintain the cell’s environment – establish homeostasis
surface area to volume ratio
Surface Area to Volume Ratio
  • Surface area acts as limiting factor in size of cell because is a two dimentional unit
  • Volume is three dimentional, so increases more quickly than the surface area can accomodate
fluid mosaic model
Fluid Mosaic Model
  • Cell membrane and embedded proteins are not locked into position – they flow against one another as the cytoplasm and the external liquid environment dictate
cytoplasm
Cytoplasm
  • Entire region between the nucleus and the cell membrane
  • The semifluid substance that fills this area is called CYTOSOL, and this is what the organelles are suspended in
cell wall
Cell Wall
  • Found in plant cells (another barrier in ADDITION to the cell membrane)
  • Protects the cell
  • Gives support to cell
  • Made of polysaccharide called cellulose
  • Is very porous and allows molecules to pass through, but is NOT SELECTIVELY PERMEABLE