GCSU Microbiology Final (Bachoon) || 100% Verified Answers.
definition of a virus correct answers a submicroscopic, parasitic, filterable agent consisting of a
nucleic acid surrounded by a protein coat
which is smaller, viruses or bacteria? correct answers bacteria
what can a virus infect? correct answers -invertebrates
-vertebrates
-plants
-protists
-fungi
-bacteria
when are viruses considered to be alive? correct answers ONLY when they are inside the host
they infect
where do they multiply? correct answers inside living cells
are viruses sensitive to antibiotics? correct answers NO
what are viruses sensitive to? correct answers interferon
host range correct answers - the spectrum of host cells a virus can infect
- most can only infect one specific host because it requires a specific site to attach to its host
- those that infect bacteria are called "bacteriophage" or "phage"
what 3 things makes up a virus? correct answers 1) nucleic acid
2) capsid
, 3) envelope (on some viruses)
1) nucleic acid correct answers - have DNA (or) RNA; not both
- double stranded or single stranded
- linear or circular
genome size? correct answers ranges from a few thousand nucleotides to as many as 250,000
2) capsid correct answers - protein coat surrounding and protecting the nucleic acid
what is the capsid composed of? correct answers protein subunits called "capsomeres"
3) envelope correct answers - on some viruses, it covers the capsid.
- some envelopes may have "spikes" which are carbohydrate protein complexes that project from
the surface
what is the envelope made up of? correct answers - lipids
- proteins
- carbohydrates
what does the host immune system produce to the virus surface protein? correct answers
antibodies
what causes multiple infections by the same virus? correct answers in response to the immune
system producing antibodies to the virus surface protein, the virus can mutate these proteins at a
high rate causing multiple infections by the same virus
definition of a virus correct answers a submicroscopic, parasitic, filterable agent consisting of a
nucleic acid surrounded by a protein coat
which is smaller, viruses or bacteria? correct answers bacteria
what can a virus infect? correct answers -invertebrates
-vertebrates
-plants
-protists
-fungi
-bacteria
when are viruses considered to be alive? correct answers ONLY when they are inside the host
they infect
where do they multiply? correct answers inside living cells
are viruses sensitive to antibiotics? correct answers NO
what are viruses sensitive to? correct answers interferon
host range correct answers - the spectrum of host cells a virus can infect
- most can only infect one specific host because it requires a specific site to attach to its host
- those that infect bacteria are called "bacteriophage" or "phage"
what 3 things makes up a virus? correct answers 1) nucleic acid
2) capsid
, 3) envelope (on some viruses)
1) nucleic acid correct answers - have DNA (or) RNA; not both
- double stranded or single stranded
- linear or circular
genome size? correct answers ranges from a few thousand nucleotides to as many as 250,000
2) capsid correct answers - protein coat surrounding and protecting the nucleic acid
what is the capsid composed of? correct answers protein subunits called "capsomeres"
3) envelope correct answers - on some viruses, it covers the capsid.
- some envelopes may have "spikes" which are carbohydrate protein complexes that project from
the surface
what is the envelope made up of? correct answers - lipids
- proteins
- carbohydrates
what does the host immune system produce to the virus surface protein? correct answers
antibodies
what causes multiple infections by the same virus? correct answers in response to the immune
system producing antibodies to the virus surface protein, the virus can mutate these proteins at a
high rate causing multiple infections by the same virus
