MCPHS MICROBIOLOGY EXAM 3 QUESTIONS AND
ANSWERS WITH COMPLETE VERIFIED SOLUTIONS
VERIFIED
What do viruses do outside of host cell?
viruses are dormant outside their host cell until attachment happens. Chance collision results in
attachment. Then enzymes react with the cell surface that causes the nucleic acid to be squirted into the
cell; physical injection. Then within seconds, the host cell is dead. Because the enzymes quickly break
host genome.
What are viruses
non-cellular, obligate, intracellular parasites.
• contain DNA or RNA (never both)
- could be double/single/linear/circular stranded, depends on virus
What so viruses contain?
• contain a protein coat- "capsid". protects nucleic acid of virus.
- some are enclosed by an envelope - (host membrane) Its part of the virus particle, just the outer layer.
It surrounds the whole virus and is liquid based.
,What do virus envelopes do?
• helps give virus an "in", the next
time they encounter host cell, since its membrane
to membrane. That's a fluid mosaic and all of
a sudden that virus finds itself inside
because the membrane just kind of melt together
• already resembles host cell
What do viruses infect?
• Most viruses infect only specific types of cells in one host. • will have specific host cells, even in
multicellular hosts
• sometimes they're limited to one type of cell
What determines a virus's host range?
Specific host attachment sites and cellular factors.
What must every virus be able to do to infect a host?
Attach to its host first before it can initiate infection.
Viruses come in different sizes and shapes.
True or False
True
, Viruses are pure chemicals.
True or False
True
adenoviruses
cause common cold symptoms
- over 200 adenoviruses
Bacteriophage
kind of virus that infects bacteria
Do viruses have genus and species names?
Viruses don't have genus and species name,
often the virus is named after the disease that it causes - or some other designation
What is the shape of viruses?
Viruses have basic shapes.
What do all viruses have that encloses and protects their nucleic acid?
Capsids
What are the protein coats that enclose and protect the nucleic acid of viruses called?
Capsids
What are the identical subunits that make up capsids called?
Capsomeres
ANSWERS WITH COMPLETE VERIFIED SOLUTIONS
VERIFIED
What do viruses do outside of host cell?
viruses are dormant outside their host cell until attachment happens. Chance collision results in
attachment. Then enzymes react with the cell surface that causes the nucleic acid to be squirted into the
cell; physical injection. Then within seconds, the host cell is dead. Because the enzymes quickly break
host genome.
What are viruses
non-cellular, obligate, intracellular parasites.
• contain DNA or RNA (never both)
- could be double/single/linear/circular stranded, depends on virus
What so viruses contain?
• contain a protein coat- "capsid". protects nucleic acid of virus.
- some are enclosed by an envelope - (host membrane) Its part of the virus particle, just the outer layer.
It surrounds the whole virus and is liquid based.
,What do virus envelopes do?
• helps give virus an "in", the next
time they encounter host cell, since its membrane
to membrane. That's a fluid mosaic and all of
a sudden that virus finds itself inside
because the membrane just kind of melt together
• already resembles host cell
What do viruses infect?
• Most viruses infect only specific types of cells in one host. • will have specific host cells, even in
multicellular hosts
• sometimes they're limited to one type of cell
What determines a virus's host range?
Specific host attachment sites and cellular factors.
What must every virus be able to do to infect a host?
Attach to its host first before it can initiate infection.
Viruses come in different sizes and shapes.
True or False
True
, Viruses are pure chemicals.
True or False
True
adenoviruses
cause common cold symptoms
- over 200 adenoviruses
Bacteriophage
kind of virus that infects bacteria
Do viruses have genus and species names?
Viruses don't have genus and species name,
often the virus is named after the disease that it causes - or some other designation
What is the shape of viruses?
Viruses have basic shapes.
What do all viruses have that encloses and protects their nucleic acid?
Capsids
What are the protein coats that enclose and protect the nucleic acid of viruses called?
Capsids
What are the identical subunits that make up capsids called?
Capsomeres
