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Micro Lesson 6 Viruses stu notes

Micro Lesson 6 Viruses stu notes - Lesson6: Asareview,...

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Lesson 6: Introduction to Microbiology Viruses in the Dental Environment Differences between viruses and bacteria As a review, a virus is a small non-living organism that consists of a small  segment of nucleic acid and possibly some enzymes that assist it in  replication.  There are a few main differences between a bacterium and a virus.  Bacteria contain both DNA and RNA as their nucleic acids, a virus has either  RNA or DNA, never both.  Bacteria reproduce by binary fission, viruses replicate by taking over the  machinery of the host cell and directing the formation of new viral capsids.  Bacteria can be grown on an artificial culture media whereas viruses need a  __________  host cell in order to be grown. Bacteria have a cell wall and are susceptible to antibiotics, and viruses have  neither.  Viruses have a protein _______ that surrounds the enclosed nucleic acid, and  because they live inside of the host cell, they are not susceptible to  antibiotics.  Viral structure The basic structure of a virus is very simple; a small piece of _______  acid  surrounded by a protein coat is called a cased. The virus may contain some other enzymes used for entry into the cell and for basic  replication functions.   Once inside the cell, the viral genome begins to direct the cell metabolism.  1
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The cell becomes a factory that produces the pieces necessary to build a new  virus.  Once the pieces are synthesized, then they are assembled into a functional  virus, ready to _______  a new cell.  As the cell builds the new viruses, they are released into the surrounding intracellular  space in one of two ways: 1) As the number of viruses inside the cell increases, the cell will either allow the  viruses to ________  through the cell membrane, just like they entered, so that they  acquire a cell membrane envelope so they’ll be recognized by the next host cell.  (That’s one way they can be released) 2) The second is through cell ________ . As the number of viruses builds inside the  cell, eventually the cell cytoplasm gets full and the expanding pressure causes the  cell to explode, releasing all the newly formed viral particles.  The Essentials on Hepatitis A Hepatitis A is caused by a small single-stranded _____  virus that has no  envelope.  It is inactivated by ultraviolet light, exposure to ________  at 100 ° C for 5  minutes and by exposure to 2% glutaraldehyde for 15 minutes.
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