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Dee New Stuff Ok Essay

  • Submitted by: dazzle2794
  • on April 2, 2014
  • Category: English
  • Length: 2,071 words

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Below is an essay on "Dee New Stuff Ok" from Anti Essays, your source for research papers, essays, and term paper examples.

Chapter   6 notes keyterms
Microscopy
  * In a light microscope (LM), visible light is passed through a specimen and then through glass lenses
  * Three important parameters of microscopy
      * Magnification, the ratio of an object’s image size to its real size
      * Resolution, the measure of the clarity of the image, or the minimum distance of two distinguishable points
      * Contrast, visible differences in parts of the sample
  * Most subcellular structures, including organelles (membrane-enclosed compartments), are too small to be resolved by an LM
  * Two basic types of electron microscopes (EMs) are used to study subcellular structures
  * Scanning electron microscopes (SEMs) focus a beam of electrons onto the surface of a specimen, providing images that look 3-D
  * Transmission electron microscopes (TEMs) focus a beam of electrons through a specimen
  * TEMs are used mainly to study the internal structure of cells

Cell Fractionation
  * Cell fractionation takes cells apart and separates the major organelles from one another
  * Centrifuges fractionate cells into their component parts
  * Cell fractionation enables scientists to determine the functions of organelles
  * Biochemistry and cytology help correlate cell function with structure
Concept 6.2: Eukaryotic cells have internal membranes that compartmentalize their functions
  * The basic structural and functional unit of every organism is one of two types of cells: prokaryotic or eukaryotic
  * Only organisms of the domains Bacteria and Archaea consist of prokaryotic cells
  * Protists, fungi, animals, and plants all consist of eukaryotic cells
Comparing Prokaryotic and Eukaryotic Cells
  * Basic features of all cells
      * Plasma membrane
      * Semifluid substance called cytosol
      * Chromosomes (carry genes)
      * Ribosomes (make proteins)
  * Prokaryotic cells are characterized by having
      * No nucleus
      * DNA in an...

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