Which of the following does NOT occur during bacterial conjugation?
A) Direct contact between donor and recipient cells
B) Shortening of the pilus
C) Enzymatic cleavage of one strand at the origin of transfer
D) Unidirectional transfer of both DNA strands
E) Recipient cell becomes a donor cell after conjugation
1 Answer
If the virus is present as a provirus in the host cell, it remains latent and never produces new virus.
A) True
B) False
1 Answer
The polygenic mRNA codes for making one long polyprotein which is then cleaved into the separate individual virus proteins.
A) True
B) False
1 Answer
If the DNA of the provirus is transcribed:
A) Several single mRNA strands are produced
B) A plasmid is made
C) The provirus detaches and becomes lytic
D) One long polygenic mRNA is produced
1 Answer
The provirus state exists when:
A) Double-stranded viral DNA is integrated into host cell chromosome
B) Single-stranded viral RNA is integrated into host cell chromosome
C) Double-stranded viral RNA is integrated into host cell chromosome
D) Single-stranded RNA is present as a plasmid in the host cell
E) Double-stranded DNA is present as a plasmid in the host cell
1 Answer
Retroviruses have:
A) One copy of single-stranded RNA
B) Two copies of single-stranded RNA
C) One copy of double-stranded RNA
D) Two copies of single-stranded DNA
1 Answer
Which of the following is an extended medical application to understanding how viruses attack?
Using viruses to assist in DNA Fingerprinting
Using viruses to insert healthy DNA into cells whose genetic material has been damaged by injury or disease.
Using viruses for gene therapy technique
Two of the above are applications
All of the above are applications
1 Answer
The virus infects a host cell by:
The host cell engulfing the virus through endocytosis.
The virus removing the DNA from the host.
The virus pierces the outer surface of the host cell and injects its DNA.
The virus stays attached to the surface of the cell and takes over its genetic machinery.
1 Answer
The mechanism of entry into a host cell involves protein rearrangements in what part of the virus structure?
Capsid
Base plate
DNA
Tail Fibers
1 Answer
The particular virus studied in this research was one that infects E-coli bacteria called:
T-4
West Nile Virus
Varicella zoster
HIV
1 Answer
