Viruses (Micro Packet 5) Flashcards
A mature virus particle
virion
A virion contains
one type of nucleic acid: DNA or RNA
Viruses are not
cells
a nucleic acid is surrounded by
a protein coat called a capsid
Why are viruses considered non living?
the are unable to reproduce outside of a living host
what are spikes used for and what do they cause
absorption and hemoglutination q
influenza infects
red blood cells
spikes are only found on
enveloped viruses
a naked piece of nucleic acid, like RNA that can be infectious is called a
viriod
Viruses multiply inside
living host cells using the host cells DNA, RNA, ribosomes to synthesize specialized infectious elements
Viruses are classified by
size, nucleic acid, morphology and the number of capsomeres
viruses get into the cell by
pinocytosis and phagocytosis
How do we study viruses in the laboratory
- we grow viruses in lab animals
- we grow viruses in embryonated eggs
- we grow & study biruses in cell culture the cells form a monolayer of cells
- we can grow them in bacterial cultures
how can we study viruses in bacterial cultures
the growth of viruses will produce a clear area on a lawn of bacterial growth called a plaque.
the ability of a virus is to infect an organism is regulated by a
- host species
- type of cells
- availability of the attachment site
- cell factors necessary for viral replication
Reproduction of viral multiplication
- adsorption
- penetration
- uncoating
- biosynthesis
- maturation
- release
Adsorption
a virus attaches to a cell membrane
