Reference no: EM13936456
1. Detergent antiseptics inactivate viruses by
a. dissolving the envelope of enveloped viruses.
b. Altering the nucleic acid of RNA viruses.
c. Disrupting the capsid of all viruses.
d. None of the above (A-C) is correct.
2. Interferon's are produced by
a. Viruses as the begin replication.
b. Various body cells on infection by viruses.
c. Bacteria in response to viral infection.
d. Drug companies for use against bacteria.
3. All the following are possible methods for cultivating viruses except
a. Fertilized chicken eggs.
b. Tissue cultures.
c. Laboratory animals.
d. Blood agar medium
4. Viral envelopes usually are acquired by
a. Budding through a membrane of the cell host.
b. Synthesizing envelope lipids under direction of the virus.
c. An outgrowth of the genome membrane.
d. Reaction with interferon membrane.
5. Formaldehyde is useful in the inactivation of viruses because it
a. Dissolves the lipids of the capsid.
b. Reacts with free amino groups on nitrogenous bases.
c. Precipitates the protein component of the envelope.
d. Replaces important bases in the construction of the genome.
6. Where bacteriophages have destroyed the cells in a lawn of bacteria
a. A clumping of red blood cells will occur.
b. Interferon's will form.
c. A plaque will be observed.
d. No noticeable change will be obvious.
7. Inactivated viruses used in vaccines
a. Multiply in the body at a low rate.
b. Contain lysogenic proviruses that induce antibody formation.
c. Act like drugs in the body.
d. Cannot replicate in the body.
8. Halogen compounds, heavy metal compounds, and phenol derivatives inactivate viruses by
a. Altering the structure of the genome.
b. Changing the protein structure of the capsid.
c. Dissolving the lip structure of the envelope.
d. Interacting with the spikes of the viral envelope.
9. Enveloped viruses are released from the host cell by
a. Lysing their host
b. Budding through the host membrane.
c. Lysogenizing their host.
d. Use of reverse transcriptase.
10. Because viruses have neither a cell wall nor metabolism, they are not susceptible to
a. Antibodies
b. Interferon
c. Antibiotics
d. Attenuation
11. Kapok spots, Lipshutz bodies, and Downey cells are all regarded as signs of the presence of viruses in body tissue.
a. True
b. False
12. An attack of Mumps, whether in one gland or both, generally yields permanent immunity.
a. True
b. False
13. Rubeola is a dangerous disease in pregnant women because the virus is transmitted from mother to child during childbirth.
a. True
b. False