Chapter 6 Study Q Flashcards
What criteria are used to define a virus?
Non cellular, DNA or RNA (never both), not technically alive,
Why don’t bacteriophages have envelopes?
Probably because it doesn’t bud from host cell, it lysis
What are common shapes of virions?
Symmetric- icosahedral, tegument
Filamentous/helical
Complex
Asymmetric
Enveloped virus vs complex virus
Envelope- has an envelope, typically from budding from host
Complex- combination of helical and polyhedral forms, complex multiparty structures (look like alien rover)
Define bacteriophage
Virus that infects bacteria only
Size of virus compared to bacteria
Itty bitty virus. Big bacteria
Define capsid and capsomere
Capsid- protein shell composed of capsomeres, protects and introduces genome into host cells
Capsomeres- small protein subunits
Describe how most animal viruses obtain their envelope?
Budding from host
Define prion and name an infection cause by a prion
Prion is good protein gone bad and it convinced other proteins to unfold as well
Mad cow and scrapie
What does an animal virus consist of structurally?
DNA or RNA, capsid, envelope
Compare Baltimore classification and proteomics analysis of bacteriophages? Which reflects evolution?
Baltimore studies wether it’s ss or ds and DNA and RNA
Proteomics analyses the proteome
Better for evolution
Why do normal sterilization techniques not kill prions
Prions don’t dissociate at high heat like normal proteins,
Define temperate phage
Phage that can infer grate it’s DNA with that of the host
