Intro Flashcards
(47 cards)
Viruses genome type (general)
Either DNA or RNA (Not Both)
Virus organelles
None
Do viruses contain Muramic acid?
No
Do viruses have ribosomes?
No, mostly.Areanavuris packages ribosomes “accidentally”
Classical virus classification scheme based on what 4 properties?
- Genome type (size, strandedness, shape, +/-, segment)2. Symmetry3. Lipid membrane4. Virion/Capsid size
ICTV classification emphasizes what?
The viral genomeAlso based on viral structure (symmetry, icosahedral, helical, enveloped vs non-enveloped)
Baltimore classification
clusters into family based on the TYPE of genome*complement to ICTV
Baltimore DNA viruses
Groups 1 + 21. +/- dsDNA2. + ssDNA
Baltimore RNA viruses
Groups 3,4,53. +/- dsRNA4. + ssRNA5. - ssRNA
Which type of RNA virus is complimentary to RNA
-ssRNAIt has to create (+) strand to generate mRNA for protein synthesis
Copying of which strand of dsRNA will generate mRNA?
Negative (-) strand
Baltimore retroviruses
Groups 6 + 76. +ssRNA7. +/-dsDNA
RNA viruses typically have a _____ genome
Smallerdue to higher error rate
dsRNA viruses – two properties
One pieceSegmented
DNA viruses single or double stranded?
Both!
Virus genomes are ____ (referring to # of copies). Which virus is the exception?
HaploidRetroviruses (have two copies)
Capsid definition
Protein (VIRAL) shell surrounding the nucleic acid
Nucleocapsid made of…
Capsid + Nucleic Acid
Helical virus capsid is ______ and made of _________?
cylindrical made of capsomere surrounding the RNA
Polyhedral virus capsid components
Capsomere and spikes
Capsid made of ____ proteins
Viral
Capsid is more or less stable than envelope?
More!
Capsid is stable to what things?
- Temp2. pH3. Proteases4. Detergents5. Drying
Viral envelope composed of
Lipid, protein, glycoproteinMembrane from host, proteins from virus
