Chapter 6: Viruses Flashcards
March of dimes was established by
Fdr
What kinds of life forms can be detected by viruses?
All of them
Most frequent infections of college students:
- Rhinovirus
- Epstein-barr (mono)
- Sexually transmitted viruses
Host range
The group of hosts a particular virus can infect
Small viruses can have _____ genes while some large viruses can have _____ ______.
10; over 1000
Rna molecules that infect plants
Viriods
Viriods have no
Protein capsid
Composed of repeated protein subunits
Viral capsid
Symmetrical viruses
- Icosahedral
2. Filamentous
Icosahedral viruses
Polyhedral with 20 identical triangular faces. exhibits rotational symmetry
A long tube of protein with the genome coiled inside
Filamentous viruses
In some ________ viruses, the capsid is enclosed in a ________.
Icosahedral: envelope
T4 bacteriophages are
Asymmetrical viruses
Viral genomes include:
- capsid
- Envelope proteins (if need be)
- Polymerase not found in host cell
ICTV
International committee on taxonomy of viruses
Ictv criteria (5):
- Genome comp
- Capside symm
- Envelope
- Size of virion
- Host range
Baltimore classification
- Genome comp
2. Route used to express rna
7 types of viruses
Group i: ds dna II: ss dna III: ds rna IV: (+) ss rna (mrna) V: (-) ss rna (complement) VI: rna retro VII: pararetro
