20 Questions
What is the primary criterion used in the classical system to classify viruses?
Symmetry of the protein shell
Which type of virus is characterized by a capsomere structure and a length of 18 x 250 nm?
Tobacco Mosaic Virus
In virology, what is a common method for determining virus titer?
Plaque formation assay
What is a characteristic feature of RNA viral shapes known as helical viruses?
Capsomeres arranged in a spiral along the nucleic acid
Which type of virus is known for forming syncytium, a fused cell with multiple nuclei?
Murine leukemia virus
What is a virus composed of?
Protein surrounded by a coat of nucleic acid
Which scientist discovered the Tobacco Mosaic Virus in 1935 by crystallizing the virus?
Wendell Stanley
What term refers to the protein coat surrounding the viral nucleic acid?
Capsid
Which step comes first in the lytic cycle of phage T4?
Entry of phage DNA and degradation of host DNA
What triggers the excision of viral DNA from the chromosome in the lysogenic cycle of bacteriophage lambda?
UV light
What is the function of viral envelopes?
Help the virus attach to host cells
Which virus is closest in size to a smallpox virus?
Bacteriophage T4
What is the role of viral glycoproteins in viruses' host range?
Affect the number of species the virus can infect
In attachment of animal viruses, which method involves viral glycoproteins staying in the cytoplasmic membrane of the host?
Membrane fusion
What is the primary function of tail sheath and tail fiber in bacteriophages?
Help the bacteriophage attach to bacterial cells
What is the process by which the cytoplasmic membrane of the host engulfs a virus?
Endocytosis
Which of the following is NOT part of the viral genome classification?
Capsomeres
In the Baltimore classification, which category does single-stranded DNA viruses fall into?
Single-stranded RNA (+) strand
Which type of viral genome has both + strand and - strand RNA?
(+) Strand RNA with DNA intermediate
What is the central dogma used for in the classification of viruses?
Classifying viruses based on their genome type
Learn about the history, diversity, and taxonomics of viruses in this quiz prepared by Dr. Nick Inglis. Explore what viruses are, their significance in human health, and their contributions to molecular biology research. Dive into the discovery of viruses like Tobacco Mosaic Disease by Beijernick in 1898.
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