virology exam 1

virus

An infectious, obligate intracellular parasite comprising of genetic material (DNA or RNA), surrounded by a protein coat, sometimes a membrane

poison

origin of the Latin word virus

virus first hypothesis

the theory that viruses originated from primitive, pre-cellular RNA replicons

progressive hypothesis

the theory that viruses originated from segments of cellular nucleic acid which acquired the ability to replicate at the expense of the host cell

regressive hypothesis

the theory that viruses originated form free-living organisms which gradually lost genetic information until they became totally dependent on the biosynthetic pathways of their host cells

co-evolution hypothesis

the theory that viruses originated at the same time as host cells and have co-evolved with them

false

T or F: viruses are alive

true

T or F: viruses are extremely small

Robert Koch

discovered germ theory

protection and delivery of the genome

function of structural proteins

true

T or F: viruses require host cells to grow and replicate

mRNA

production of viral _______ is required for synthesis of viral proteins by host cells, which is a central event in replication of viruses