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

Heart, Septa prevent oxygenated and deoxygenated blood. Give reason

Septa prevent oxygenated and deoxygenated blood. Give reason

How to get a stock primer concentration of 100µm, I have 30µg of a primer, ...

I have 30µg of a primer, whose molecular weight is 600. How much water should I add to get a stock primer concentration of 100µM?

Why do male and female gametes diffrent from each other, Q. Concerning thei...

Q. Concerning their size and basic morphology how and why do the male and the female gametes differentiate from each other? The female gametes are big cells full of vitellus (n

Write the definition of counselling, Q. Write the definition of counselling...

Q. Write the definition of counselling? Definition of counselling "A process of helping or enabling a person / persons to solve certain interpersonal, emotional problems and

How the rhizopus reproduce?, How the Rhizopus reproduce? Rhizopus usual...

How the Rhizopus reproduce? Rhizopus usually reproduce asexually, but under unfavourable conditions, sexual reproduction (isogamous) occur resulting in formation of zygospores

Degradation of fats, Q. Explain Degradation of Fats? Fats are the este...

Q. Explain Degradation of Fats? Fats are the esters of glycerol and fatty acids and are called as 'glycerides'. Fats are susceptable to hydrolysis, oxidation and other che

Production of rare hybrids, Production of Rare Hybrids Hybridization ...

Production of Rare Hybrids Hybridization is a well established plant breeding procedure to obtain superior plants by combining useful characters distributed in different plan

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

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

Zoonoses disease-ehrlichiosis, Ehrlichiosis The disease is caused by a ric...

Ehrlichiosis The disease is caused by a rickettisia, called Ehrlichia canis. Dogs and man are the reservoir hosts. The infection is transmitted through bite of infected tick, Rhip

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