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double strand of nucleotides which can never contain uracil; form bases with hydrogen bonds (weak)
1. all plants are composed of cells
2. all animals are composed of cells
3. cells have a definite structure + function
4. cells come from pre-existing cells
Coarse adjusting knob
(course focusing mechanism) gives a coarse image, use 1st when focusing, can only be used under scanning or low power
(stereo microscope) very little magnification and resolution; normally used to study macroscopic specimens
uses ultraviolet light; has better magnification and better resolution then a compound microscope; uses a fluorescent stain; used to study different parts of the cell
phase contrast microscope
better magnification + resolution then compound microscope; based on the ability of the specimen to absorb different amounts of light
best magnification and resolution; uses a beam of electrons instead of light
used to study viruses, the ultra structure of a cell, and atoms
more than one color dye, see the differences between cells, see the differences between two different cells
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