Exam 2 Review Flashcards
In what ways do viruses differ from other pathogens?
they lack cytoplasm and organelles
What is the best criteria to classify a virus?
type of nucleic acid
How do viruses choose their host?
based on affinity between viral and cellular surface molecules
Extracellular state of a virus?
nucleocapsid
capsomere
makes viral capsid
bacteriophage
virus that infects bacteria
What only occurs in the lysogenic cycle but not in the lytic replication cycle?
formation of prophage
What type of nucleic acid is found only in viruses
?
single-stranded DNA and double stranded RNA
What is the main difference between prophage and provirus?
prophage can be excised from the host DNA but provirus cannot
The enzyme lysozyme is responsible for which stages of a bacteriophage T4 infection cycle?
entry and release
What does not carry nucleic acid but still replicates and can cause disease?
prions
What is responsible for spongiform encephalopathies?
prions
What does the autoclave use to sterilize?
moist heat
How can prions be destroyed?
autoclaving in concentrated sodium hydroxide solution and incineration
What lacks RNA genome but lacks capsid or protein?
viroid