Biology 1107 Study Guide ( Quiz 2 )
Biology 1107 Study Guide ( Quiz 2 ) Biology 1107
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This 3 page Study Guide was uploaded by Hunter McElmurray on Monday February 22, 2016. The Study Guide belongs to Biology 1107 at East Georgia State College taught by Dr. Silva in Winter 2016. Since its upload, it has received 33 views. For similar materials see General Biology in Biological Sciences at East Georgia State College.
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Date Created: 02/22/16
Study Guide: Biology 1107 Quiz 2: Microscopy- they are used to visualize cells Three important parameters of microscopy: 1. Magnification: Ratio of an objects image size to its real size 2. Resolution: Measure of the clarity of the image or the minimum distance of two distinguishable points 3. Contrast: Visible differences in brightness between parts of the sample Electron microscopes: Are used to study subcellular structures Cell fractionation: enables scientists to determine the functions of organelles Prokaryotic Cells: No nucleus DNA in an unbound region called the nucleoid No membrane-bound organelles Cytoplasm bound by the plasma membrane Eukaryotic Cell: Membrane-bound organelles DNA in a nucleus that is bounded by a membranous nuclear envelope membrane and nucleus Has internal membranes that partition the cell into organelles Cytoplasm in the region between the plasma me Endomembrane system consists of : Vacuoles Endoplasmic reticulum Plasma membrane Nuclear envelope Lysosomes Golgi apparatus Nucleolus: Is located within the nucleus and is the site of ribosomal RNA (rRNA) synthesis. Chromosomes: is composed of a single DNA molecule associated with protein Lysosomes: is a membranous sac of hydrolytic enzymes that can digest macromolecules Vacuoles: are large vesicles derived from the ER and Golgi apparatus Perform a variety of functions in different kinds of cells Food vacuoles: formed by phagocytosis Contractile vacuoles: Found in many freshwater protists , pump excess water out of cells Central vacuoles: found in many mature plant cells, hold organic compounds and water Three types of molecular structures: Microtubules: are the thickest of the three components of the cytoskeleton. o Are hollow rods made of Tubulin o Functions: shaping the cell, Guiding movement of organelles, separating chromosomes during cell division. o Microfilaments: its also called actin filaments, are the thinnest components o Resisting pulling forces within the cell o Help support the cells shape Intermediate filaments: are fibers with diameters in a middle range
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