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

Role of dietitian in health care, Role of Dietitian in Health Care The ...

Role of Dietitian in Health Care The role of the dietitian has come a long way since the early 1900s. Their role is still unknown to a  lot of people. Some think that dietitian

Example of structural function of organic molecules, Q. What are the few ex...

Q. What are the few examples of the structural function of organic molecules? Organic molecules have a structural function as they are part of cell membranes, organ walls, cyto

Explain consultant dietitians, Explain Consultant dietitians Consultant...

Explain Consultant dietitians Consultant dietitians work under contract with healthcare facilities  or  in  their own private practice. They perform nutrition screenings  for

Human genome initiative, Human Genome Initiative is the collective name fo...

Human Genome Initiative is the collective name for number of projects begun in 1986 by Department Of Energy (DOE) to  (1) create an ordered set of DNA segments from known chrom

Medical science in ancient india, MEDICA L SCIENCE IN ANCIENT INDIA D...

MEDICA L SCIENCE IN ANCIENT INDIA Dhanvantri -"God of Medicine". Ashvini Kumar - Famous medical man of vedic times. Susruta - First Indian to study human anatomy;

Sonology, Sonology : This is the study of hearing. Sonology is a type of sc...

Sonology : This is the study of hearing. Sonology is a type of science of neologism which is used to describe the study of sound in a variety of disciplines. In medicine, this term

Explain nutritional properties of the eggs, Explain nutritional properties ...

Explain nutritional properties of the eggs Drying of eggs under normal conditions causes little loss of the nutritional properties of the eggs. Vitamin A, vitamin B, thiamine,

Differ from our current use of retroviruses, In what way may we be able to ...

In what way may we be able to take advantage of retrotransposons in human gene therapy? How would this differ from our current use of retroviruses?

State the active hyperemia, Which of the following is true for active hyper...

Which of the following is true for active hyperemia, a local control mechanism within the circulatory system? A. There will be a decrease in force developed by smooth muscles s

Show the principles of prevention of diabetes mellitus, Q. Show the Princip...

Q. Show the Principles of Prevention of diabetes mellitus? Principles of primary prevention of diabetes are:     Creating awareness of diabetes mellitus   Identifying Pre-D

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