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microbiology Question and answers rated A+
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microbiology Question and answers rated A+ Acelluar Lacks protein and capsid coating RNA molecule At this point only infects plants, but may possibly be contributing factor to multiple diseases in animals - correct answer viroids -are small, infectious proteins. - Lack RNA and DNA - ...

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  • August 11, 2024
  • 24
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • Microbiology
  • Microbiology

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microbiology
Acelluar
Lacks protein and capsid coating
RNA molecule
At this point only infects plants, but may possibly be contributing factor to
multiple diseases in animals - correct answer ✔viroids


-are small, infectious proteins.
- Lack RNA and DNA
- They cause many progressive, fatal, neurological diseases.
-Scrapie in sheep.
-Bovine spongiform encephalopathy (or mad cow disease)
-Creutzfeldt-Jakob disease in humans
- Chronic wasting disease in elk and deer
- May be involved in some feline diseases - correct answer ✔Prions


Symptoms may include dementia, loss of coordination, difficulty sleeping, and
impaired memory and intellect.
- All prion diseases cause spongiform encephalopathy; the brain becomes
riddled with holes, like a sponge. - correct answer ✔prion disease


Microcope - correct answer ✔optical instrument consisting of a lens or
combination of lenses for making enlarged images of minute objects


resolving power - correct answer ✔optical instrument to produce separate
images of closely placed objects

,compound microscope - correct answer ✔a light microscope that uses more
than one lens to magnify an object


objects appear against a bright background. - correct answer ✔brightfield
condenser


objects appear as bright images against a dark background - correct answer
✔darkfield condenser


use a beam of electrons rather than light to make an image and can achieve
higher resolution than light microscopes.
-process kills the sample! - correct answer ✔Electron Microscopes


We can classify microbes as ? - correct answer ✔Acellular, Prokaryotic,
Archaea, Eukaryotic


- are acellular: they are not living cells!
-have either DNA or RNA
- cannot replicate on their own; they depend on a host cell.
-cannot divide by binary fission, mitosis, or meiosis.
-cannot produce energy.
-depend on the ribosomes, enzymes, and other molecules of the host to
produce proteins and replicate DNA.
- can only be seen by an electron microscope - correct answer ✔viruses


have a genome of either DNA or RNA surrounded by a protein coat called a
capsid.

, Some also have a lipid and polysaccharide outer coating. - correct answer
✔virus structure


viruses can infect what type of organisms? - correct answer ✔Animals,
Plants, Bacteria, Archaea


The virus attaches to a cell bearing the appropriate markers on its surface.
The virus can only infect cells they can recognize and attach to; this is why
some viruses that can infect dogs but not us and vice versa. - correct answer
✔step 1 adsorption


The virus injects in genome into the cell - correct answer ✔step 2 penetration


The viral nucleic acid is released from the capsid. - correct answer ✔step 3
uncoating


The viral nucleic acid controls the host cell. The host cell produces more viral
nucleic acid and viral proteins. This step can be postponed for a variable
period; this is called latent infection. - correct answer ✔step 4 biosynthesis


The virus "pieces" the host cell has made are assembled into new viruses. -
correct answer ✔step 5 assembly


The new virions are released from the host cell.
This may involve destruction of the host cell or "budding" from the cell
membrane. - correct answer ✔step 6 release


The protein involved is a normal human and animal protein active in the brain.
cannot be disinfected with boiling or irradiation. Strong bleach may work.

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