Microbiology Quiz 6
Arthropods typically serve as which mechanism of transmission for viruses?
biological vector
Reverse transcriptase is used to generate which nucleic acid from RNA?
cDNA
The protein subunits that surround the nucleic acid of a virus are known as which of the following?
capsomeres
Viruses can be visualized using which method?
electron microscope
The excision of the viral genome from the host chromosome is known as which of the following?
induction
Which effect does tomato planta macho viroids have on the crop?
loss of chlorophyll
Which unit of length best describes the average size of a virion
nm
Transmissible spongiform encephalopathies, such as Creutzfeldt-Jakob disease, are caused by which of the following?
prion
In the lysogenic cycle of bacteriophages, the integrated phage genome is known as which of the following?
prophage
In retroviruses, the integrated phage genome is known as which of the following?
provirus
Which of the following is a novel enzyme found in retroviruses?
reverse transcriptase
The liquid portion of blood that does not contain clotting factors is known as which of the following?
serum
Chicken pox can reemerge as which disease?
shingles
The Baltimore Classification system describes viruses according to which characteristic?
the viral genome
Which mechanism of horizontal gene transfer relies on the use of viruses?
transduction
Which of the following is the host-cell receptor that recognizes human immunodeficiency virus (HIV)?
CD4
Which of the following is not a property of a virus?
It is an infectious cellular pathogen
Which scientist first discovered prions?
Stanley Prusiner
Which method cannot be used to detect virus in a patient's serum?
growth in pure culture
Which of the following is the scientist responsible for first discovering viruses (specifically, tobacco mosaic virus)?
Dimitri Ivanovski
Which statement regarding the introduction of virus in eggs is true?
Pox can form on the embryo
(−)ssRNA is transcribed into (+)ssRNA using which of the following?
RNA polymerase encoded by the virus
A bacteriophage infects a host cell and the genome integrates itself into the host chromosome. Sometime later, the phage is excised along with a short piece of DNA adjacent to the insertion point. Both the phage DNA and the host DNA are packaged into the same capsid. The bacteriophage then infects a new cell, delivering both phage and bacterial DNA. Which process is being described in this scenario?
The lysogenic cycle, reactivating as the lytic cycle, followed by specialized transduction
Which of the following viruses does not cause latent infections?
adenovirus
You are a nurse and you suspect that you may have been exposed to a particular virus. You and your health care provider decide to perform a hemagglutinin assay. A sample of your serum is taken and added to a sample of virus. Next, the virus and serum sample are added to erythrocytes. Upon examination, you do not see any agglutination occurring. Which can you conclude from these results?
The test result suggests you may have been exposed to the virus, and your serum contains antibodies against the virus
