MICROBIOLOGY EXAM QUESTIONS AND ANSWERS #11
1. D. Hepatitis B virus is partially enveloped
Poxviruses obtain the envelope from the cell membrane, where the
envelope comes from they Replicate in cytoplasm
Herpesviruses obtain the envelope from the nuclear membrane -
remember DNA viruses help replicate in the nucleus (nuclear
membrane is where the envelope comes from)
The viral envelope can fuse with the cell membrane to promote viral
infection
- This allows it to enter the host cell
Remember B19 is parvovirus: Which one of the following descriptions about viral
envelope is INCOR- RECT?
A. Poxviruses obtain the envelope from the cell membrane
B. Herpesviruses obtain the envelope from the nuclear membrane
C. B19 and adenoviruses do not have envelope, so they are called naked viruses
D. Hepatitis B virus is partially enveloped
E. The viral envelope can fuse with the cell membrane to promote viral infection
2. B. Reassortment
Remember phenotypic mixing is only mixing the phenotypes not the
actual genes: A scientist performed an experiment to produce hybrid viruses by mixing two
ditterent serotypes of influenza virus, H1N1 and H2N2, in a respiratory epithelium cell line. Several days
later, the scientist collected the media and analyzed the viral progeny. She found the following
serotypes of the virus to be: H1N1, H2N2, H1N2, H2N1. Which of the following terms best explains the
appearance of new serotypes?
A. Recombination
B. Reassortment
C. Complementation
D. Phenotypic mixing
E. Transformation
3. C. The specimen contains both, DNA and RNA
,MICROBIOLOGY EXAM QUESTIONS AND ANSWERS #11
This is because most carry only DNA OR RNA, not both. But the
exception is
,MICROBIOLOGY EXAM QUESTIONS AND ANSWERS #11
cytomegalo virus
The specimen has no organelles - There are bacteria that have no
organelles as well
The specimen Is resistant to antibiotics - There are bacteria and fungi
that are resistant to antibiotics: A scientist is investigating a specimen in a laboratory. She is
attempting to determine whether it is a virus or not. Which of the following would allow her to
conclude that it is not a virus?
A. The specimen is extremely small
B. The specimen has a protein coat
C. The specimen contains both, DNA and RNA
D. The specimen has no organelles
E. The specimen Is resistant to antibiotics
4. B. 25-300 nm: The typical size range for a virus is approximately:
A.
5. Determining whether It contains both DNA and RNA: You are studying
an illness in a patient. What factor will help you determine that the agent causing the illness is
NOT a virus?
6. A. Circular double stranded RNA
Refer to chart in SDL slides: This type of nucleic acid is absent among viruses?
A. Circular double stranded RNA
B. Circular double stranded DNA
C. Circular single stranded RNA
D. Double stranded RNA
E. Single stranded DNA
7. A. B19: The DNA viruses can be classified as double stranded DNA (dsDNA) or as single stranded
DNA (ssDNA) viruses. Identify the virus that DOES NOT contain dsDNA genome?
A. B19
,MICROBIOLOGY EXAM QUESTIONS AND ANSWERS #11
B. Cytomegalovirus
C. Hepatitis B virus
1. D. Hepatitis B virus is partially enveloped
Poxviruses obtain the envelope from the cell membrane, where the
envelope comes from they Replicate in cytoplasm
Herpesviruses obtain the envelope from the nuclear membrane -
remember DNA viruses help replicate in the nucleus (nuclear
membrane is where the envelope comes from)
The viral envelope can fuse with the cell membrane to promote viral
infection
- This allows it to enter the host cell
Remember B19 is parvovirus: Which one of the following descriptions about viral
envelope is INCOR- RECT?
A. Poxviruses obtain the envelope from the cell membrane
B. Herpesviruses obtain the envelope from the nuclear membrane
C. B19 and adenoviruses do not have envelope, so they are called naked viruses
D. Hepatitis B virus is partially enveloped
E. The viral envelope can fuse with the cell membrane to promote viral infection
2. B. Reassortment
Remember phenotypic mixing is only mixing the phenotypes not the
actual genes: A scientist performed an experiment to produce hybrid viruses by mixing two
ditterent serotypes of influenza virus, H1N1 and H2N2, in a respiratory epithelium cell line. Several days
later, the scientist collected the media and analyzed the viral progeny. She found the following
serotypes of the virus to be: H1N1, H2N2, H1N2, H2N1. Which of the following terms best explains the
appearance of new serotypes?
A. Recombination
B. Reassortment
C. Complementation
D. Phenotypic mixing
E. Transformation
3. C. The specimen contains both, DNA and RNA
,MICROBIOLOGY EXAM QUESTIONS AND ANSWERS #11
This is because most carry only DNA OR RNA, not both. But the
exception is
,MICROBIOLOGY EXAM QUESTIONS AND ANSWERS #11
cytomegalo virus
The specimen has no organelles - There are bacteria that have no
organelles as well
The specimen Is resistant to antibiotics - There are bacteria and fungi
that are resistant to antibiotics: A scientist is investigating a specimen in a laboratory. She is
attempting to determine whether it is a virus or not. Which of the following would allow her to
conclude that it is not a virus?
A. The specimen is extremely small
B. The specimen has a protein coat
C. The specimen contains both, DNA and RNA
D. The specimen has no organelles
E. The specimen Is resistant to antibiotics
4. B. 25-300 nm: The typical size range for a virus is approximately:
A.
5. Determining whether It contains both DNA and RNA: You are studying
an illness in a patient. What factor will help you determine that the agent causing the illness is
NOT a virus?
6. A. Circular double stranded RNA
Refer to chart in SDL slides: This type of nucleic acid is absent among viruses?
A. Circular double stranded RNA
B. Circular double stranded DNA
C. Circular single stranded RNA
D. Double stranded RNA
E. Single stranded DNA
7. A. B19: The DNA viruses can be classified as double stranded DNA (dsDNA) or as single stranded
DNA (ssDNA) viruses. Identify the virus that DOES NOT contain dsDNA genome?
A. B19
,MICROBIOLOGY EXAM QUESTIONS AND ANSWERS #11
B. Cytomegalovirus
C. Hepatitis B virus
