E. Viral envelope

Question 1

envelope

Answer 1

a layer outside the capsid. all animal viruses w/helical capsid have one. some icosohedral virus have one

Question 2

viruses w/o an envelope are called

Answer 2

naked

Question 3

envelope structure

Answer 3

composed of a phosholipid bilayer derived from a host cell membrane like PM. virally encoded glycoproteins inserted into bilayer called spike proteins

Question 4

glycoprotein structure

Answer 4

composed of one or more polypeptide each w/ one or more domains. internal domain is in contact w/other viral protein. transmembrane domain is short hydrophobic helix. also external domain

Question 5

external domain of glycoprotein structure

Answer 5

is larger than other domains, glycosylated, includes the site for binding to host cell receptors. major antigen determinant of virus, mediates fusion during entry of some viruses

Question 6

overall shape of envelope virus is

Answer 6

spherical or pleomorphic