Bio2 Chap. 19

Front 1

Why is virus not a bacteria?

Back 1

experiment showed that bacteria is not what's causing the disease in the plants

Front 2

viral genome

Back 2

multiple kinds of nucleic acids can make up the genome

Front 3

capids

Back 3

protein shell enclosing the viral genome

Front 4

viral envelopes

Back 4

viruses maybe further wrapped in this membranous envelopes

derived from the membranes of the host cell/ stuff from the viral origin

Front 5

bacteriophage (phage)

Back 5

viruses that infect bacteria

Front 6

tobacco mosaic virus VS influenza virus

Back 6

tmv - helical capsid with the overall shape of a rigid rod

inf - outer enveloped with glycoprotein spikes, 8 different RNA molecules each wrapped ina helical capsid

Front 7

virus - nonliving or living?

Back 7

virus may be nonliving b/c they can not perform any living activity unless there are in a host cell

may be living since it can change shape without any proteins

Front 8

host range

Back 8

each type of virus can infec cells of only al imited variety of hosts

Front 9

general viral reproductive cycle

Back 9

1) virus enters cell
2) host replicate the viral genome
3) host transcribe mRNA to make capsid proteins
4) self-assemble into new virus and exit the cell

Front 10

lytic cyle

Back 10

reproducitve cycle of phages - death of the host cell

virulent phage - only by lytic cycle

1) attach; 2) enter phage DNA, destoryed host DNA; 3) synthesis of viral genomes and proteins; 4) assemble into phages; 5) released and breaks the cell wall