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Unformatted text preview: , focuses a beam of electrons through the specimen or onto its surface. Electrons have much shorter wavelengths than visible length. Scanning electron microscope, useful for detailed study of the surface of a specimen. 3-D image. Transmission electron microscope, used to study internal ultrastructure of cells. Not 3-D Cell fractioniation: takes cells apart/ separates the major organelles & other subcellular structures from one another. Instrument used is the centrifuge, which spins test tubes holding mixtures of disrupted cells at various speeds. Causes some cell components to settle to the bottom, forming a pellet. Enzymes found in the nucleus: DNA polymerase, RNA polymerase, DNA binding proteins, RNA binding/processing proteins. Fluid of the nucleus: nucleoplasm....
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- Spring '08