Viruses
Viruses
1. Emergence of infectious diseases can be due to all of the following except:
a. Antibiotic resistance
b. Climatic changes
c. Digging up soil
d. Microbes trying to cause disease
e. Travel
2. Which of the following would be the first step in biosynthesis of a virus with a -strand of RNA?
a. Synthesis of DNA from an RNA template
b. Synthesis of double-stranded RNA from an RNA template
c. Synthesis of double-stranded RNA from a DNA template
d. Transcription of mRNA from DNA
e. None of the above
3. An envelope is acquired during which of the following steps?
a. Penetration
b. Adsorption
c. Uncoating
d. Release
e. Biosynthesis
4. The following steps occur during replication of a DNA virus. What is the third step?
a. Maturation
b. DNA synthesis
c. Transcription
d. Translation
e. Release
5. Viruses that have reverse transcriptase are in the:
a. Retroviridae and Picornaviridae
b. Herpesviridae and Retroviridae
c. Hepadnaviridae and Retroviridae
d. Bacteriophage families
e. _Influenzavirus_
6. DNA made from an RNA template will be incorporated into the virus capsid of:
a. Retroviridae
b. Herpesvirdiae
c. Hepadnaviridae
d. Bacteriophage families
e. _Influenzavirus_
7. Which of the following is not true about viruses?
a. Viruses contain DNA or RNA but never both
b. Viruses contain a protein coat
c. Viruses use the anabolic machinery of the cell
d. Viruses use their own catabolic enzymes
e. None of the above
8. The following steps occur during multiplication of Herpesviruses. What is the third step?
a. Attachment
b. Biosynthesis
c. Penetration
d. Release
e. Uncoating
9. The following steps occur during multiplication of Retroviruses. What is the fourth step?
a. Synthesis of double-stranded DNA
b. Synthesis of +RNA
c. Attachment
d. Penetration
e. Uncoating
10. Nontoxic strains of _Vibrio cholerae_ can become toxic when they are in the human intestine with toxic strains of bacteria. This suggests that the toxin genes are acquired by:
a. Host enzymes
b. Prions
c. Reverse transcriptase
d. Transduction
e. None of the above
11. An oncogenic RNA virus must have which of the following enzymes?
a. DNA-dependent DNA polymerase
b. Lysozyme
c. RNA-dependent RNA polymerase
d. RNA-dependent DNA polymerase
e. All of the above
12. Some viruses, such as Herpes simplex, infect a cell without causing symptoms; these are called:
a. Latent viruses
b. Lytic viruses
c. Phages
d. Slow viruses
e. Unconventional viruses
13. Bacterial viruses derive all of the following from the host cell except:
a. Lysozyme
b. tRNA
c. Amino acids
d. Nucleotides
e. None of the above
14. Prion diseases are probably due to:
a. Mutations in the PrP gene
b. Post-translational change in PrP
c. Synthesis of PrP
d. Lysogency
e. A transposon
15. The definition of lysogeny is:
a. Virus DNA is incorporated into host cell DNA
b. Lysis of the host cell due to a phage
c. The period during replication when virions are not present
d. When the burst time is unusually long
e. None of the above