Download Microbiology lecture homework 6 Capsids are composed of a) DNA

Microbiology lecture homework 6
1- Capsids are composed of
a) DNA b) RNA c) lipids d) proteins
2a)
b)
c)
d)
Temperate phages often
lyse their host cell all the time
integrate their DNA into the host DNA
change properties of their hosts
both b and c are correct
3a)
b)
c)
d)
All phages must have the ability to
have their nucleic acid enter the host cell
have their nucleic acid replicate in the host cell
synthesize RNA molecules
both a and b are correct
4a)
b)
c)
d)
The tail fibers on phages are associated with
penetration
attachment
protein translation
transcription
5a)
b)
c)
d)
The phages QB and MS2 are
single stranded RNA lytic phages
have a large burst size
Have double stranded DNA
Both a and b are correct
6- True or False
T4 phage is single stranded DNA lytic phage.
7- True or false
Single stranded RNA lytic phages have a large burst size and attach to F+ pili Host cells.
8- True or False
T4 is considered a double stranded DNA virulent phage meaning it is lytic.
9- True or False
Transduction is the transfer of DNA from one bacterial cell to a donor bacterial cell.
10- Phage lambda DNA integrates into the E.coli genome at a specific site through a process called
a) transduction
b) translation
c) transcription
d) site specific recombination
11- Which enzyme removes the lambda viral DNA from the host DNA once the repressor molecules are
removed or no longer active?
a) excisase
b) ligase
c) lipase
d) nuclease
12- Which enzyme destroys the host DNA once a cell is infected with a virus?
a) DNAase
b) RNAase
c) Reverse transcriptase
d) None of the above
13- True or False
The enzyme lysozyme helps a phage break through the bacterial cell wall.
14- The induction of a temperate phage can be achieved by exposing the bacterial cells to ultra violet light.
This is probably the result of
a) destroying the repressor molecules and allowing RNA polymerase to bind to the promoter region and
transcribing a messenger RNA.
b) destroying the cell wall of the host
c) destroying the virus
d) all of the above
15-Viroids
a) contain only single stranded RNA and cause disease in plants
b) use reverse transcriptase in their replication
c) are similar in structure to phages
d) can cause human diseases
16-Animal viruses can be classified according to
a) lipid composition
b) Ribosome count
c) Genome type, shape and presence of an envelope
d) None of the above
17-True or False
Prions are infectious agents that consist of only RNA.
18-True or False
An acute infection tends to be localized, short in duration and often checked by the host’s immune system.
19-The enzyme that HIV utilizes to copy its RNA genome into a complimentary DNA strand and create an
RNA- DNA hybrid is
a) nuclease
b) lysozyme
c) lipase
d) reverse transcriptase
20-True or False
Unlike a lambda phage, HIV integrates its genome randomly into the host’s genome.
21-True or False
A naked phage can enter by both endocytosis and entry following membrane fusion method.
22-These proteins on enveloped viruses aid in the process of entry
a)
b)
c)
d)
spike proteins
collagen
tubulin
capsomeres
23-The building blocks of the capsid are
a) capsomeres
b) glucose
c) phospholipids
d) none of the above
24-True or False
Herpes type I can be considered a latent persistent infection.
25-A method used by animal viruses to exit the host cell is
a) budding
b) active transport
c) binary fission
d) nuclear fission
26-Filamentous phages
a) always kill the host cell
b) are long thin fiber- like phages that can multiply inside the host without killing the host allowing the
host to also multiply.
c) contain only RNA
d) none of the above
27-An example of a single stranded DNA lytic phage is
a) M13 phage
b) Phi X 174 phage
c) T4 phage
d) Lambda phage
28-True or False
According to our textbook, there are 14 families of RNA containing viruses and 8 DNA containing viruses.
29-The viral capsid together with the nucleic acid that is tightly packed within the protein coat is called
a) nucleocapsid
b) lipid layer
c) lipid raft
d) matrix proteins
30-True or False
In the carrier state, infectious virions of Hepatitis B can be continually produced and detected in the
bloodstream, semen and saliva.
31-True or False
HIV disease has features of slow virus infections.
32- All phages must have the ability to
a.
b.
c.
d.
have their nucleic acid enter the host cell
have their nucleic acid replicate in the host
both a and b
none of the above
33- The polio virus is an example of
a.
b.
c.
d.
RNA virus
DNA virus
Both DNA and RNA
A prion
34- Animal viruses are divided into a number of families whose names end in
A. -virus.
B. -viridae.
C. -viscous.
D. -eieio.
.
35-There are _______ families of RNA containing viruses that infect vertebrates.
A. two
B. five
C. seven
D. fourteen
.
36-The receptors to which animal virus attachment proteins usually bind are
A. proteins.
B. carbohydrates.
C. nucleic acid.
D. lipids.
E. glycoproteins.
37-When an enveloped virus adsorbs to the host cell with its protein spikes, the virions are taken into the cell by the
process of
A. penetration.
B. production.
C. fusion.
D. endocytosis.
38-The enveloped viruses typically obtain their envelope
A. from the host plasma membrane.
B. as they exit the host.
C. from a newly constructed viral-derived membrane.
D. from the nuclear membrane.
E. from the host plasma membrane AND as they exit the host.