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MCPHS MICROBIOLOGY EXAM 3 QUESTIONS AND ANSWERS WITH COMPLETE VERIFIED SOLUTIONS VERIFIED $10.49   Add to cart

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MCPHS MICROBIOLOGY EXAM 3 QUESTIONS AND ANSWERS WITH COMPLETE VERIFIED SOLUTIONS VERIFIED

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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...

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  • November 2, 2024
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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

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