Sample Questions 2 Flashcards
(32 cards)
Generally, in a DNA-containing virus infection, the host animal cell supplies all of the following except
A) RNA polymerase.
B) Nucleotides.
C) DNA polymerase.
D) tRNA.
E) None of the above.
C) DNA polymerase.
Put the following in the correct order for DNA-virus replication:
1-Maturation;
2-DNA synthesis;
3-Transcription;
4-Translation.
A) 1,2,3,4
B) 2,3,4,1
C) 3,4,1,2
D) 4,1,2,3
E) 4,3,2,1
B) 2,3,4,1
A viral species is a group of viruses that
A) Have the same morphology and nucleic acid.
B) Have the same genetic information and ecological niche.
C) Infect the same cells and cause the same disease.
D) Can’t be defined.
B) Have the same genetic information and ecological niche.
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.
C) Hepadnaviridae and Retroviridae.
DNA made from an RNA template will be incorporated into the virus capsid of
A) Retroviridae.
B) Herpesviridae.
C) Hepadnaviridae.
D) Bacteriophage families.
E) Influenzavirus.
C) Hepadnaviridae.
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.
D) Viruses use their own catabolic enzymes.
Some viruses, such as Human Herpes Virus 1, infect a cell without causing symptoms; these are called
A) Latent viruses.
B) Lytic viruses.
C) Phages.
D) Slow viruses.
E) Unconventional viruses.
A) Latent viruses.
Latent viruses are present in cells as
A) Capsids.
B) Enzymes.
C) Prophages.
D) Proviruses.
E) None of the above.
D) Proviruses.
Which one of the following steps does not occur during multiplication of a Rhabdovirus?
A) Synthesis of (+) strands of RNA
B) Synthesis of (-) strands of RNA
C) Synthesis of viral proteins
D) Synthesis of DNA
D) Synthesis of DNA
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.
D) Transduction.
An oncogenic RNA virus must have which of the following enzymes?
A) DNA-dependent DNA polymerase
B) Lysozyme
C) RNA polymerase
D) Reverse transcriptase
E) All of the above
D) Reverse transcriptase
Which of the following is most likely a product of an early gene?
A) Capsid proteins
B) DNA polymerase
C) Envelope proteins
D) Spike proteins
E) Lysozyme
B) DNA polymerase
Most RNA viruses carry which of the following enzymes?
A) DNA-dependent DNA polymerase
B) Lysozyme
C) RNA-dependent RNA polymerase
D) Reverse transcriptase
E) ATP synthase
C) RNA-dependent RNA polymerase
Most prokaryotic cellular reproduction is the result of
A. Conjugation.
B. Binary fission.
C. Meiosis.
D. Mitosis.
B. Binary fission.
As prokaryotes divide, a wall is formed. This wall is known as a(n)
A. Septum.
B. Internal membrane.
C. DNA fragment.
D. Plasmid.
A. Septum.
“Extra-chromosomal DNA” would best describe
A. Viruses.
B. Prions.
C. Plasmids.
D. Mitochondria.
C. Plasmids.
The mature virus particle together with its envelope (if it possesses one) is called the
A. Virus.
B. Capsid.
C. Virion.
D. Nucleocapsid.
C. Virion.
The concept of a virus was first developed in the 19th century by
A. D. Ivanowsky
B. R. Koch
C. P. Rous
D. M.W. Beijerinck
D. M.W. Beijerinck
The _____ is the protein coat of the virus; the _____ lacks this protein coat.
A. Capsid / virion
B. Capsomere / viroid
C. Capsid / viroid
D. Capsomere / virion
C. Capsid / viroid
The typical animal virus has
A. Icosahedral geometry.
B. An axis of 5-fold symmetry.
C. Commonly 60 units per particle.
D. All of the above.
D. All of the above.
Which of the following does not apply to enveloped viruses?
A. The membrane lipids are host derived.
B. The glycoproteins of the virus membrane are host encoded.
C. The membrane functions in host penetration.
D. The membrane plays a role in viral infection specificity.
B. The glycoproteins of the virus membrane are host encoded.
Single stranded RNA viruses may form mRNA in a host cell by
A. Directs copying (i.e., virus was -RNA)
B. RNA replicase.
C. Reverse transcriptase.
D. Any of the above.
D. Any of the above.
Commonly, virus capsids have a regular symmetry. This trait is due to
A. The repetitive pattern of morphological units made up of a few specific proteins.
B. A complex architectural design based on a large number of different
proteins.
C. The mineral or crystalline nature of the virus particle.
D. The protective reaction of the host cell which encases it.
A. The repetitive pattern of morphological units made up of a few specific proteins.
In the polio virus, the viral +RNA
A. Acts directly as mRNA.
B. Forms ±DNA which activates a reverse transcriptase.
C. Forms ±RNA.
D. Activates a reverse transcriptase directly (without ±DNA
involvement ).
A. Acts directly as mRNA.
