| A | B |
|---|
| hypothesis | a possible explanation for an event or set of observations |
| variable | any factor that can influence the outcome of an experiment |
| control setup | the experimental variable is missing |
| experimental setup | the experimental variable is present |
| prection | an if...then statement |
| microscope | an instrument that uses lenses to produce an enlarged, focused image of a speciman |
| resolution | the ability to distinguish two points as separate points |
| contrast | the ability to see detail with a microscope depends on this |
| electron microscopes | use a beam of electrons to create an image |
| light microscopes | focus light onto a specimen using a mirror or light bulb |
| codon | a specific sequence of three consecutive nucleotides that is part of the genetic code and that specifies a particular amino acid in a protein or starts or stops protein synthesis |
| transmission electron microscopes | used to study slices of organisms |
| scanning electron microsopes | study the surface of a specimen |
| field study | a study that takes place in an org's natural environment |
| plus of being in a laboratory for a study | can control factors |
| electrophoresis | molecules of a mixture are separated according to their shape, size, and electrical charge |
| cell fractionation | cells are mixed in a blenderlike device, then put into a centrifuge. at a slow speed, the densest organelle settle to the bottom of the spinning test tube and form a pellet. process is repeated over and over |
| centrifuge | a tool that separates mixtures by spinning them at various speeds |
| chromatography | the components of a mixture of gas or liquid can cometimes be separated by this technique |
| tissue culture | a technique in which biologists grow large amounts of a single kind of cell |
