![]() ![]() This exercise will help you identify the cultural characteristics. In the identification of bacteria and fungi much weight is placed on how the organism grows in or on media. ![]() Capsules can be seen by viewing bacteria in India ink. A colony is defined as a visible mass of microorganisms all originating from a single mother cell, therefore a colony constitutes a clone of bacteria all genetically alike. LPS can be toxic to a host and can stimulate the host's immune system.Ĭapsule: This layer of polysaccharide (sometimes proteins) protects the bacterial cell and is often associated with pathogenic bacteria because it serves as a barrier against phagocytosis by white blood cells. Outer Membrane: This lipid bilayer is found in Gram negative bacteria and is the location of lipopolysaccharide (LPS) in these bacteria. Mycoplasma are bacteria that have no cell wall and therefore have no definite shape. Gram staining is a procedure that allows you to divide bacteria into 2 common types: Gram positive, and Gram negative. ![]() Most of the bacteria can be classified into the following shapes. The three primary shapes in bacteria are coccus (spherical), bacillus (rod-shaped) and spirillum (spiral). 1 Use Gram staining to see if bacteria are Gram positive or Gram negative. Flagellated Bacteria (Tetanus Bacteria) Comma-shaped Bacteria (Vibrio Cholera) Rod-shaped Bacteria (Salmonella) As already mentioned, before the advent of DNA sequencing, bacteria were classified based on their shapes and biochemical properties. In the space are enzymes and other proteins that help digest and move nutrients into the cell.Ĭell Wall: Composed of peptidoglycan (polysaccharides + protein), the cell wall maintains the overall shape of a bacterial cell. Periplasmic Space: This cellular compartment is found only in those bacteria that have both an outer membrane and plasma membrane (e.g. ![]()
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