Glossary of bio 2 2

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subcellular structures
plasma membrane
functions as a selective barrier that allows sufficent passage of nutrients and oxygen and waste
resolving power
measure of clarity in image
prokaryotic cells
no nucleus, genetic material is concentrated in the nucleoid, but no membrane separates this region from the rest of the cell
light microscopes
refract (bend the light to magnify and project image
powerful machines that spin to split cells into different organelles
the place in a prokaryotic cell where the DNA is concentrated, without a membrane that sparates tbis region from the rest of the cell.
semifluid medium in which organelles are suspended
contains most of the genes that control the cell
eukaryotic cell
true nucleus enclosed in a nuclear envelope.
scanning electron microscope (SEM)
useful in studying the sruface of the specimen
electron microscope (EM)
focuses a beam of electrons; have to kill cells
the entire region b/w tthe nucleus and the emebrane bounding the cell
transmission electron microscope (TEM)
mainly to study internal structure of cells
cell fractionation
takes the cell apart so that thier individual functions can be studied.

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