Gram-positive and Gram-negative bacteria: Difference

gram-positive and gram-negative bacteria

Introduction Microorganisms are categorized under bacteria, viruses, fungi, and mycoplasma. Some of the microorganisms are disease-causing some are saprophytes or some are heterotopic in nature. Bacteria are cosmopolitan, unicellular, rigid cell-walled, prokaryotic microorganisms. They are simple in structure cause diseases in plants and animals. The following article is about gram-positive and gram-negative bacteria and their … Read more

Are viruses living or not? Origin and properties

are viruses living or not ?

Introduction Are viruses living or not? is a very difficult question to understand. The virus has attributes of both living organisms and nonliving objects. Thus it can be considered as both living and nonliving Origin of Virus There are two main views on the origin of the virus A. I. Oparin suggested that complex molecules of … Read more

Virus difference: animal, plant, & bacteriophage

virus difference

Difference between animal, plant virus, and bacteriophage Viruses are very small even smaller than bacteria and are mainly parasitic in nature. Depending upon the host, they are widely categorized under three different types namely animal, plant viruses, and bacteriophage. Although all of them have basic similarities depending on the host type and genetic material these … Read more

Types of viruses: structure, classification and reproduction

Types of viruses

Introduction There is no nomenclature system for virus classification since they are not considered truly living. As we all know living organisms have a definite cellular structure. That raises an interesting question of what actually viruses are. And what are the types of viruses and their structure? Viruses are named according to the type of … Read more

Types and simple definition for viruses and structure

definition for viruses

Virus definition In Latin, the word virus means poisonous or venomous fluid coined by Dmitri Ivanowsky (1892). He recognized certain microbes causing mosaic diseases of tobacco are smaller than that of bacteria. These are very very minute submicroscopic biological entities. Thus, definition for viruses is that it does not have any cellular organelles but definitely … Read more