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2015-09-23 01:19:05
micro lecture exam 1
Micro easy way book
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  1. This scientist showed that without contamination, microorganisms could not develop by using sealed flasks. Also, by heating certain beverages, it lowered the microbial count to prolong its shelf life.
    Louis Pasteur
  2. This scientist created the postulates that links specific microorganisms to a specific disease.
    Robert Koch
  3. This scientist invited a porcelain filter that had small enough holes that bacteria could not fit through them, which could be grown and tested.
    Charles Chamberland
  4. This scientist found the existance of viruses by taking the fluid that was filtered through a bacterial filter, discovering there were microorganisms smaller than bacteria.
    Dimitri Ivanowski
  5. In 1898, this scientist found that viruses could only multiply in living plant cells, and can even remain active if the plant cell compltely dried.
    Martinus Beijerinck
  6. What two molecules are viruses made of?
    Nucleic acids and proteins
  7. What does it mean that a virus is considered a obligate intracellular parasite?
    It enters a living cell, takes it over, make mor of themselves, leaves and often destroys the host cell.
  8. What are the different types of nucleic acids does a virus have?
    • Double stranded DNA (dsDNA)
    • Single     "             "        (ssDNA)
    • dsRNA
    • ssRNA
  9. what are and how do viruses build their capsids?
    A protein coat that protects the nucleic acid: uses many repeats of proteins called capsomeres.
  10. What ar envelopes in viruses and how are they built?
    An additional layer surrounding the capsid: i is taken from the host cell as the virions exit.
  11. How are spikes formed in viruses?
    As a virion exists the host cell's membrane, it takes part of that membrane called an envlope, which can then protude from the envlope surface, forming spikes.