Virus Definition A Level Biology

Virus biology synonyms virus biology pronunciation virus biology translation english dictionary definition of virus biology.

Virus definition a level biology. A virus is a small infectious agent that replicates only inside the living cells of other organisms. A virus is a chain of nucleic acids dna or rna which lives in a host cell uses parts of the cellular machinery to reproduce and releases the replicated nucleic acid chains to infect more cells. Learn about the history types and features of viruses. Viruses are mysterious biological agents which.

Viruses are ultra microscopic non cellular living particles composed solely of a nucleic acid dna or rna core surrounded by a protein envelope called capsid. Virus infectious agent of small size and simple composition that can multiply only in living cells of animals plants or bacteria. It is non cellular but consisting of a core of dna or rna surrounded by a protein coat. A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism.

A virus is often housed in a protein coat or protein envelope a protective covering which allows the virus to survive between hosts. Viruses a submicroscopic infectious agent that is unable to grow or reproduce outside a host cell. Viruses are microscopic organisms and can be seen only under electron microscope in nature any living organism is affected by virus then it will take a serious turn. For proper survival of the plants and animals they have to struggle against the environment their different factors and other living organisms.

Since dmitri ivanovsky s 1892 article describing a non bacterial pathogen infecting tobacco plants and the discovery of the tobacco mosaic virus by martinus beijerinck in 1898. The largest virus known as the mimivirus can measure up to 500 nanometers in diameter. The name virus means venom or poisonous fluid given by louis pasteur. Viruses are extremely small approximately 20 400 nanometers in diameter.

Viruses possess unique infective properties and thus often cause disease in host organisms. Supplement a virus requires a living cell for it to grow and reproduce similar to an obligate intracellular parasite. A virus particle also known as a virion is essentially nucleic acid dna or rna enclosed within a protein shell or coat. Viruses can infect all types of life forms from animals and plants to micro.