Download Virus Quiz 1. When a bacteriophage is integrated into a cellular

Virus Quiz
1.
a)
b)
c)
d)
When a bacteriophage is integrated into a cellular genome it is called what?
Bacteriophage
Prophage
Lysogenic Cycle
Lytic Cycle
2. What is the typical reproduction cycle of a DNA virus?
a) It integrates into a cell, translating DNA and producing mRNA, which then the viral
mRNA is translated making viral proteins.
b) They reproduce like mitosis.
c) It integrates into a cell, translating DNA and producing mRNA, which then the viral DNA
is translated making viral proteins.
d) Does not successfully reproduce
3. What makes a virus a nonliving thing?
a) It does not respond to stimuli
b) Does not contain DNA
c) Does not reproduce
d) It can not carry out a life cycle independent from a host cell
4. ​Usually viruses are separated into several large groups based primarily on what?
a) Host range
b) Capsid size
c) Cycle it is involved in
d) The type of virus they are
5. A change from lysogenic cycle to lytic cycle is usually induced by which of the following?
a) Cell Division does not occur properly
b) Antibiotics
c) Cell dies
d) Ultraviolet light
6. Why don’t restriction enzymes destroy the DNA of the bacterial cells that produce them?
a) Doesn’t know the nucleic sequence code to destroy cell at
b) They do
c) Restriction enzymes can only destroy RNA
7. Why is it difficult to develop vaccines for retroviruses?
a) RNA mutates more frequently then DNA
b) Capsid of retrovirus is resistant
c) Vaccines only target blood-borne pathogens
d) The small size evades the immune system
8. Why do some viruses seem to go away and then return later, like a cold sore?
a) Host has been infected by a different strain
b) The immune system forgot it
c) Virus entered lysogenic cycle
d) Virus had mutated
9. What are capsids?
a) Protein shell that encloses the viral genome
b) Integrated viral DNA
c) Small, circular DNA that replicates separately
d) Enzyme that seals bonds
10. Which of the following diseases is caused by a virus?
a) Smallpox
b) Mono
c) Neither
d) Both A & B
ANSWERS
1- ​B- ​Only the prophage injects itself into the cell because it has the viral DNA, not the protein.
2- ​A- ​Integrates into a cell, translating DNA and producing mRNA, which then the viral mRNA is
translated making viral proteins. These self assemble and turn into new viruses.
3- ​D-​ A virus has DNA, reproduces, and responds to stimuli but it does not carry out a life cycle
independent from host cell because it needs the host cell to produce new viruses.
4- ​A- ​Viruses have a different host range depending on what type of virus it is. A virus like
rabies has a large host range because almost any mammal can get the virus.
5- ​D- ​Antibiotics, Cell division, and cell dying has nothing to do with how the virus/prophage
makes it’s way to opposite cycle. Ultraviolet light just causes the latent stage to then enter and
become active.
6- ​A- ​Without the nucleic code no restriction enzyme can work to cut parts of certain phage, and
these restriction enzymes do not have the code bacterial cells.
7- ​A-​ Retroviruses reproduce differently than regular viruses because the replication of the RNA
causing the whole cell to be unrecognizable.
8- ​C- ​When a virus enters the lysogenic cell they become active and reproduce where as in the
lytic the virus is more “dormant” and inactive.
9- ​A-​ Capsids are protein shells that enclose viral genome, B was prophage, C was plasmids,
and D was DNA Ligase.
10- ​D- ​Both smallpox and mono is caused by a virus, both of which do not have an antibiotic to
treat.