Microbiology Chapter 6 Part 1 exam 2024/2025 with 100% correct answers
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Course
Microbiology Chapter 6 Part 1
Institution
Microbiology Chapter 6 Part 1
What are the components common to all virions?
Choose one or more:
A. envelope
B. capsid
C. DNA or RNA genome
D. DNA and RNA genomes correct answersB, C
Yes, virions are highly efficient particles requiring only a viral capsid and either an RNA or DNA genome, but never both.
Identify the f...
Yes, virions are highly efficient particles requiring only a viral capsid and either an RNA or DNA genome,
but never both.
Identify the function(s) of the viral capsid.
Choose one or more:
A. is necessary for RNA virus attachment
B. contains virulence factors that increase the severity of viral disease
C. protects the viral genome
D. determines the shape of the virion correct answersC, D
Yes, the viral capsid determines the shape of the virion and protects the viral genome from
environmental conditions.
Identify an infectious agent that is comprised of only a nucleic acid particle.
Choose one:
A. virion
B. viroid
C. bacteriophage
D. prion correct answersB
Viroids infect plants, requiring only a nucleic acid genome since they invade a plant through a damaged
cell wall and, upon entering, hijack the plant's RNA polymerase.
, Prions are aberrant proteins that cause Creutzfeldt-Jakob disease in humans, mad cow disease from
contaminated beef, and scrapie in sheep. Unfortunately, prions have demonstrated the highest
resistance to methods of chemical and physical control, including the ability to survive nucleases and UV
irradiation. Prions propagate aggregates of prion proteins by altering the normal quaternary
conformation of PrPC in the brain. Based on the quaternary structure shown below, which of the
following hypotheses could be supported?
Choose one:
A. The loss of beta pleated sheets confers resistance to PrPSc.
B. The disordered quaternary conformation of the PrPSc explains why the protein can easily form
aggregates.
C. The increased presence of alpha helices confers resistance to PrPSc.
D. The increased presence of beta pleated sheets confers resistance to PrPSc. correct answersD
PrPSc does have a higher proportion of beta pleated sheets, and this could be a viable hypothesis as to
why this protein is more resistant to methods of control.
Which of the following criteria is not part of the International Committee on Taxonomy of Viruses (ICTV)
classification system?
Choose one:
A. envelope
B. host range
C. genome composition
D. capsid symmetry
E. particle size
F. spike proteins correct answersF
Spike proteins are helpful for viral entry into a host cell, but are not used by the ICTV to classify viruses.
The discovery of giant viruses led to evidence that viruses may actually meet all characteristics of life.
These viruses encode for more than 1,000 genes and are even parasitized by smaller viruses, like the
_____ Sputnik.
- Viroid
- Prion
- Virophage
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