Q.6 Write an essay on bacteriophage.
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Answers
Answer:
d'Herelle (1917) termed the virus which destroys bacteria as bacteriophage, which literally means 'bacteria eaters' (Greek phage-to eat). They are also known as phages. Bacteriophage are obligate parasites and are dependent on living bacteria for their growth. They may be found in nature where bacteria are growing.
Explanation:
A bacteriophage (/bækˈtɪərioʊfeɪdʒ/), also known informally as a phage (/feɪdʒ/), is a virus that infects and replicates within bacteria and archaea. The term was derived from "bacteria" and the Greek φαγεῖν (phagein), meaning "to devour". Bacteriophages are composed of proteins that encapsulate a DNA or RNA genome, and may have structures that are either simple or elaborate. Their genomes may encode as few as four genes (e.g. MS2) and as many as hundreds of genes. Phages replicate within the bacterium following the injection of their genome into its cytoplasm.
Atomic structural model of bacteriophage t4. By Victor Padilla-Sanchez, PhD (Washington DC)
The structure of a typical myovirus bacteriophage
Anatomy and infection cycle of phage T4
Bacteriophages are among the most common and diverse entities in the biosphere.[1] Bacteriophages are ubiquitous viruses, found wherever bacteria exist. It is estimated there are more than 1031 bacteriophages on the planet, more than every other organism on Earth, including bacteria, combined.[2] Viruses are the most abundant biological entity in the water column of the world's oceans, and the second largest component of biomass after prokaryotes,[3] where up to 9x108 virions per millilitre have been found in microbial mats at the surface,[4] and up to 70% of marine bacteria may be infected by phages.[5]
Phages have been used since the late 20th century as an alternative to antibiotics in the former Soviet Union and Central Europe, as well as in France.[6][7] They are seen as a possible therapy against multi-drug-resistant strains of many bacteria (see phage therapy).[8] On the other hand, phages of Inoviridae have been shown to complicate biofilms involved in pneumonia and cystic fibrosis and to shelter the bacteria from drugs meant to eradicate disease, thus promoting persistent infection.[9]