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2 parts a virus must have
nucleic acid and proteins
what is an obligate intracellular pathogen
it's inert unless it infects a cell in order to form more virions.
avg size of virus
18nm to 1 micrometer
5 ways viruses classified
- the international comitty on taxonomy of viruses decides based on
- 1) nucleic acid type (RNA or DNA)
- 2) symmetry of capsid by looking first at protein types.
- 3) Enveloped or not
- 4) Dimension of virion and capsid
- 5) Genetic relatedness
viral nucleic acid is either
DNA or RNA.
3 symmetry capsid types
icosahedral, helical, and complex
Extracellular digestion, which fungi do.
explain the Viral adhesion process
a process of random chance the virus crosses paths with the host cell.
Explain viral entry or insertion
entry process called injection by poking a hole or fusion or endocytosis (tricking the cell to engulfing the cell).
explain viral synthesis?
making copies of the virus (virus uses cell's machinery to make nucleic acids and proteins).
It's a complex not well understood process.
Explain viral exit
- Lysis destroys the cell by bursting PM.
- Budding: virus pushes through cell, & steals PM parts for envelope.
5 stages of viral replication cycle?
- 1) Attachment
- 2) entry
- 3) synthesis
- 4) Assembly
- 5) Release
Difference between asexual spore formation and binary fission?
Spores produced by spore formation is resulting cells are smaller, have protective layers, and specialized spore structures.