Module 5 poll and assignment Flashcards
Based on your knowledge of viruses, what could have gone wrong with the Hershey-Chase experiments?
a. Use an RNA virus
b. Use of temperate phage
c. Use a “tail-less” phage
d. Use of “fusogenic” phage
Are viruses alive?
a. no they lack complex structure
b. no they do not have independent metabolism
c. no they do not replicate
d. no they do not evolve
e. yes
b.
You have discovered a new type of microbe and you suspect it is a virus. What type of microscopy can be used to confirm the presence of the virus?
a. TEM
b. Light microscope
c. phase-contrast microscope
d. atomic force microscopy
a.
You have discovered a new virous and it has lipids. Knowing only this, what else can you now conclude about this virus?
a. It can be classified as an enveloped virus
b. It is most likely a bacteriophage, or bacterial virus, instead of one that infects human cells
c. Its nucleic acid core will not contain RNA
d. It can be classified as a “naked” virus
a.
Why do lytic viruses exhibit a one-step growth curve?
a. lytic viruses are slowly but continuously released
b. lytic viruses only replicate during genome replication of their host
c. Lytic viruses are only released all at once
d. Lytic viruses do not require assembly for their release
e. Lytic viruses combine genome replication and assembly in one step
c.
You are creating a bacteriophage that will target gram-positive and gram-negative bacteria. Which receptor would be universal?
a. the Capsule
b. The S-layer
c. The flagella
d. The wall techoic acids
e. The lipopolysaccharides
f. none of the above
f.
You find a phage that is integrated into a bacterial chromosome. What is the best explanation?
a. It is a temperate phage
b. it is a virulent phage
c. It is a persistent phage
d. It is an oncogenic phage
a.
If a vaccine targets the spike protein on a virus, what step of the viral life cycle are you targeting?
a. attachment
b. penetration
c. uncoating
d. Biosynthesis
e. release
a.
Explain why a lytic and lysogenic (temperate) bacteriophage would not yield the same number of plaque forming units (PFUs) despite infecting the cells with the same number of infectious viral particles
a. Lytic bacteriophages are more effecting at infecting bacteria than lysogenic bacteriophages
b. Infection with a lysogenic bacteriophage induces prophage to reactivate resulting in an increased number of lytic bacteriophages
c. Plaques are formed during lysis and lyogenic infection do not always result in lysis
d. There is no reasonable explanation
c.
You isolate a virus that contains positive single stranded RNA. Their baltimore classification is?
1
2
3
4
5
6
7
4 and 6
In which of the following stages of the viral infectious cycle do enveloped viruses usually acquire their envelopes?
a. attachment
b. penetration
c. biosynthesis
d. assembly
e. release
e.
When thinking about the different outcomes of viral infections, what kind of virus is most likely being used as an anti-cancer agent?
a. a virus that causes host cell transformation of cancerous host cells
b. a virus that causes a persistent infection in cancerous host cells
c. a virus that causes latent infection in cancerous host cells
d. a virus that causes a lytic infection in cancerous host cells
e. a virus that cannot infect a cancer cell
d.
