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

How much dna is in a typical human cell, Q. How much DNA is in a typical hu...

Q. How much DNA is in a typical human cell? If DNA (deoxyribonucleic acid) molecules in a single human cell were stretched out and laid end to end they will measure approximate

Fine structure of pollen tubes grown in vitro, Fine Structure of Pollen Tub...

Fine Structure of Pollen Tubes Grown in Vitro The growth in pollen tubes is exclusively restricted to the tip. Cytochemical analysis reveals the pollen tip zone to be rich in

Sympathetic and para sympathetic nervous system, SYM P A THETI C NERVOU...

SYM P A THETI C NERVOUS SYSTEM These sympathetic chain are connected with ramus comminicause of thoracic & lumber part. Due to this reason this system is called as t

Explain the theory of law of minimum, Explain the theory of Law of Minimum ...

Explain the theory of Law of Minimum    This is one of the earliest hypotheses put forward by von Liebig on the relationship between the amount of plant  nutrient in the soil a

Explain the probiotics in foods, Explain the Probiotics in Foods? Yoghu...

Explain the Probiotics in Foods? Yoghurts have been supplemented with probiotic strains of bifidobacteria and Lactobacilli. Milks fermented solely by intestinal isolates of lac

State the amount of micronutrients in fertilizers, State the amount of micr...

State the amount of micronutrients in fertilizers The amount of micronutrients in fertilizers must be much more carefully controlled than the macronutrients. The difference be

How do chordates reproduce, Q. How do chordates reproduce? Reproduction...

Q. How do chordates reproduce? Reproduction in beings of the phylum Chordata is sexual, with the exception of urochordates that can be also reproduce asexually. In some classes

Collagen helix protein structure, Collagen Helix Collagen has a larg...

Collagen Helix Collagen has a large amount of glycine (25%) and proline (and hydroxyproline, 25%). They run parallel, form a right handed super-helix that is stabilized b

Production of healthcare, Normal 0 false false false EN...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

What is sympatric isolation, A few individuals from a herd of deer are forc...

A few individuals from a herd of deer are forced to migrate to a new herd. This is an example of  resulting in.   a.  Gene flow; enhance in similarities between populations.

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