2_6_07 - 6-Feb-07 Biology Cells Cell Theory Cell is basic...

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6-Feb-07 Biology Cells Cell Theory Cell is basic unit of life Cells only derived from cells Every organism consists of at least 1 cell (a theory is an explanation of some phenomenon that is based on facts and multiple experiments) The size of the photons limits the resolution in a light microscope The electron microscope helps to see smaller things better because of a much better resolution. Can only observe dead things Makes light microscope used more because it won’t kill May cells get their energy by diffusion Easier to diffuse when smaller surface area. explains why cells are small Homogenization – making the cells all equal (smashing and squishing the cells) Invitro – in a test tube Inviro – in a living cell Insitu – in tissue Prokaryotes (Eubacteria, Archae) o Don’t have membrane enclosed organelles: no nucleus, mitochondria, ER etc o Do have DNA in the nucleoid, cytoplasm (cytosol and ribosomes.
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