viruses

Question 1

viruses

Answer 1

small, non-cellular particles that do not embody most of the characteristics of living things. can only exist as intracellular parasites

Question 2

virus structure

Answer 2

composed of dna or rna enclosed in capsid

different shapes: cylindrical, cubical, spherical
bacteriophage: special category of virus, unique shape head and tail region. they infect and destroy bacteria cells

Question 3

host

Answer 3

cell on which another organism lives

host range: the limited # of host species, tissues, or cells a virus can infect

Question 4

virus replication

Answer 4

1. virus disassembles its parts
2. makes copies of its genetic info and parts
3. assembles copies into many identical viruses

Question 5

virus replication

lytic cycle

Answer 5

1. host cell invaded
2. virus repliactes parts and genetic info
3. multiple viruses activated and released
4. host cell is destroyed

Question 6

virus replication

lysogenic cycle

Answer 6

1. host cell invaded
2. viral dna becomes part of host cell’s chromosomes (provirus)
3. provirus replicated its parts and genetic info
4. provrius remains dormant, not active within the cell but continues replicating
5. stimuli trigger the lytic cycle

Question 7

antibiotics

Answer 7

substances inhibiting the growth of microorganisms, do not destroy viruses

Question 8

vaccine

Answer 8

liquid preparations of dead or weakened viral/bacterial cells that stimulate the body’s system to fight and produce antibodies