HALUAN DAILY – This time we will discuss what it is about virus, characteristics, classification and the mode of transmission as well as the morphology and the process of infection.
What are Viruses?
Viruses are a kind of microscopic and acellular (not made of cells) parasitic agents, which are capable of reproducing only inside the host cell, generally using its genetic replication mechanism and causing damage in the process.
Viruses are capable of infecting all forms of life, from animals and plants to bacteria and viruses virus others (virophages), and they exist in all terrestrial ecosystems (soil, Earth, or land).
Viruses are the most abundant biological form known to more than 5,000 species virus has been described since its appearance. its discovery in 1899, but it is estimated that the number could be in the millions.
Origin virus is not known for sure, because there are various theories about it. Some assume that they can evolve from plasmids (free-living DNA fragments), and others that they can originate from bacteria or other cellular organisms, despite the fact that their structure is much simpler than theirs.
What virologists agree on is that this was a very primitive organism in the history of life, despite the fact that there is no fossil record. virus.
Species virus known and preserved are not more than 90 years old. On the other hand, virus has a very large mutation capacity, which makes it very adaptable and changeable.
Virus Size
Ada virus large that can be seen through a microscope.
Most size virus so small that they cannot be seen through a light microscope, although there are exceptions such as virus large (called gyrus) that are extraordinary in size.
Virus Morphology
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