Microbiology

A virus is an infectious biological agent of small size.    The name ‘Virus’ comes from the Latin word meaning ‘poison’ or ‘slimy liquid’. The size of the viruses ranges from 20-300 nm. The chemical composition of all true viruses is nucleic acid either DNA or RNA and protein. They cannot multiply and continue the … Read more

Bacteria (singular-bacterium) are the microscopic unicellular and prokaryotic organisms. It is also known as a microbe. The term bacteria were first coined by F.J. Cohn in 1854.  Bacteria come from the Greek word manning rod. It was discovered by Antonie Von Leeuwenhoek in 1976.  It has a plant like cell-wall and autotrophic mode of nutrition. … Read more