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Microbiology: An Evolving Science 4th Edition

Microbiology: An Evolving Science (4th Edition)

Book Edition4th Edition
PublisherW. W. Norton
End of Chapter
Review Questions

Chapter 6, End of Chapter, Review Questions, Exercise 1

Page 232

Here is a tip:

Icosahedral viruses have triangular-shaped capsid and filamentous viruses have helical capsids.

Verified Answer

Viruses show different structures depending upon the types of the capsid. Following are the differences between icosahedral and filamentous (helical) viruses:

 Icosahedral VirusesFilamentous (helical) Viruses
SymmetryThey show radial symmetry.They show helical symmetry.
Monomer arrangementThe pattern of subunits is triangular and the overall structure is rotationally symmetric.Capsid monomers form helical tubes around the genome.
LengthThe polyhedron has 20 triangular faces.The length of the helical capsid extends up to 50 times its width.
SizeThe capsid has a fixed size.This varies in size to accommodate different lengths of nucleic acids.
ExamplePoliovirus, rhinovirus, and adenovirus.Influenza A virus, Soybean mosaic virus (SMV), and Tobacco mosaic virus (TMV).
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