lect 4- viruses and other a cellular infectious agents Flashcards
viruses differ from bacteria in that viruses…
are not composed of cells
what distinguishes a chronic viral infection from a latent viral infection
infectious virus gradually builds up over a long period of time
define virus
protein and nucleic acid
define viroids
only RNA
define satellites
only nucleic acids
what is the envelope of viruses a combination of
lipids, proteins and carbs
what proteins are capsids made of
protein subunits called protomers or capsomers
what is the largest animal viruses
poxviruses
what is the order for multiplication of animal viruses
attachment, penetration/entry, uncoating, biosynthesis, maturation, release
what are the 3 methods for viral entry
fusion, endocytosis and injection of nucleic acid
what is the classification of a virus based on
nucleic acid type, presence/absence of envelope, capsid symmetry, dimensions of vision and capsid
describe an acute infection
rapid multiplication–> cell death and virus release
describe latent infection
viral components are present; host is not harmed –> activation –> cell death and virus release
describe chronic infection
slow release of virus without cell death
describe transformation into malignant cell
activation of host proto-oncogenes or insertion of oncogene
