Science, asked by gopu88, 1 year ago

What is virus? give some example also

Answers

Answered by misttti
4
viruses are the infection which can transfered by one infected person to another healthy person.ex chiken pox , pleague etc

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Answered by Abhishek75700
8
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=>》■Viruses are built from short sequences of nucleic acid, either DNA or RNA wrapped in a protein shell. Until the invention of the electron microscope, it was impossible to visualize a virus.

■There are many viruses that cause what we generally call hepatitis. For example, the picornavirus hepatitis A causes common jaundice, a self-limiting disease; hepatitis B causes serum hepatitis associated with blood transfusions

■The first viruses to be visualized were bacteriophage, which appeared to have a head and tail-like structure.

■Only the nucleic acid entered the bacterial cell through the tail. Animal viruses were described as spherical or rod-shaped; they were bound to receptors and were taken up by the cell.

■Although viruses tend to be diverse in terms of the diseases they cause and the organs they attack, all viruses have a unity of structure and consist of proteins and nucleic acid.

■Some viruses are also encased in a lipid membranous envelope . Their mode of replication is not binary one divides into two, two divide into four, etc.

■As in most other organisms, but occurs as a burst of thousands of virus particles from a single virus over a short time of period.

■Although viruses were defined in part on the basis of size and filterability, viruses much larger than the traditional viruses have recently been isolated.

☆■》Using the symptoms caused by a virus can lead to confusion. There are many viruses that cause what we generally call hepatitis. EXAMPLE =》the picornavirus hepatitis a causes common jaundice, a self-limiting disease hepatitis b causes serum hepatitis associated with blood transfusions.

■Viral replication indicate that most viruses self-assemble as a result of interactions between the viral proteins to form a viral capsid that interacts with the nucleic acid to form the whole.

■Viral classification into a Linnaean scheme has been proposed, but newer methods using nucleic acid homologies are changing classification.

■Viruses are spread in the human population by various means, including airborne particles, fecal-oral contact, clothing, insects, and contact with other animals 《zoonosis》.

■Names of viruses are associated in many cases with the place the virus was first isolated EX-Ebola is the location in the Congo where the disease was first recognized》the organ from which the virus is isolated EX- adenovirus from the adenoids); the symptoms of the virus (pox virus, yellow fever) or finally with the names of the persons isolating and identifying the virus EX-EpsteinBarr》.

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