Structural features of viruses, Biology

Assignment Help:

Structural Features of Viruses

Size of Viruses

Virus particles vary widely in size. The smallest viruses e.g. virus of foot and mouth disease  measuring about 20  mill microns are about the size of largest protein molecules. The largest viruses measuring about 350 nm are as large as the smallest bacteria (Mycoplasma).

Shape and Symmetry of Viruses

Most plant viruses are rod shaped or filamentous while the animal viruses may be filamentous or roughly spherical filamentous vireos are cylindrical structures with a helical symmetry, The most animal viruses ,the helix is highly coiled into a sub spherical structure .The spherical vireos are polyhedral structured like diamonds with  a typical  icosahedra  symmetry ,  each having 20 equilateral triangular sides or facets an 12 vertices or corners.

Poxviruses and rabies virus are unique in shape and symmetry. Poxviruses are brick shaped and rabies virus is bullet shaped. These viruses are complex in structure and symmetry.

Viruses of bacteria are also unique in shape and structure. Each vision is a tadpole shaped structure having two main parts a polyhedral headland a spring like or conical tail with a thin collar in between. The free flattened end of the tail bears a large endplate or base plate from which slender hook like legs, called   tail fibres and six small pegs or spikes project different directions. Contain bacteriophages lack the endplate, tail fibres and pages. 

1369_bacteriophage.jpg                1787_influenza virus.jpg

Bacteriophage  Influenza Virus

 

79_herpes viruses.jpg                  214_polio virus.jpg

           Herpes Virus                   Polio virus


Related Discussions:- Structural features of viruses

Defination and use of stem cell, Stem cell research has been promoted as a ...

Stem cell research has been promoted as a future medical cure-all for a host of diseases, including Alzheimer's and diabetes, as well as a potential breakthrough for organ replacem

Importance of reproduction, Importance of reproduction Reproduction ...

Importance of reproduction Reproduction is an important life process in animals and plants. Reproduction is the ability of an organism to produce new generation of indivi

Benefits and dangers using dna , Read the information found in the Bioethic...

Read the information found in the Bioethics: Choices for the Future box on page 40 of the text entitled "Should you Bank your Stem Cells?"  Based on the information given, discuss

Define about the yeast - saccharomyces, Define about the Yeast - Saccharomy...

Define about the Yeast - Saccharomyces? Classification Kingdom - Mycetae Division - Amastigomycota Class - Ascomycetes Order - Endomycetales Family - Saccharomyc

Define the term - lamellac, Define the term - lamellac The inner membr...

Define the term - lamellac The inner membrane is folded into very closely packed membranes called the lamellac. The lamellae flatten out at regular intervals into structures c

Discuss about impermeable membrane, An impermeable membrane separates one l...

An impermeable membrane separates one liter of a 0.01 M glucose solution in water in the left compartment from one liter of a 0.1 M glucose solution in water in the right compartme

Define iodothyronine deiodinases - functions of selenium, Define Iodothyron...

Define Iodothyronine Deiodinases - functions of selenium in humans? Another group of selenoproteins are the iodothyronine deiodinases essential for the conversion of thyroxine

Evolution, how to calculate the frequency of mating with the HW equation?

how to calculate the frequency of mating with the HW equation?

Congenital anomalies of small and large intestines, Congenital Anomalies of...

Congenital Anomalies of Small and Large Intestines: 1) Intussusecption  Intussusecption  is the invagination or telescoping  of one part of  the intestine into another part

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd