Question

What are the three types of bacteria?

Answer 1

Bacteria are the unicellular, microscopic organisms which are present in various environments. They live in soil, ocean and inside the human gut. They are prokaryotes in nature which lack a well defined nucleus and DNA is free floating in nature known as plasmid.

Complete answer:

The bacteria cells are surrounded by two covering: outer cell wall and inner cell membrane. In some bacterias there is a third covering known as capsule. On the basis of shape, nature of cell wall, bacteria are divided into two types:

Gram positive bacteria: Gram-positive bacteria are bacteria that test positive in the Gram stain test, which has traditionally been used to quickly classify bacteria into two broad categories based on their cell wall type. Staphylococci ("staph"), streptococci ("strep"), and pneumococci are examples of Gram-positive bacteria.
Gram negative bacteria: Bacteria that do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation are known as Gram-negative bacteria. Their cell envelopes, made up of a thin peptidoglycan cell wall sandwiched between an inner cytoplasmic cell membrane and a bacterial outer membrane, distinguish them. Ex: E. coli

There are three basic types of bacteria on the basis of their shape:
1. Round bacteria: They are also known as cocci, which are round in shape.

2. Cylindrical bacteria: They are cylindrical in shape and are known as bacilli.

3. Spiral bacteria: They are spiral in shape and are known as Spirillum.

Note:
Several bacterial diseases include cholera, syphilis, anthrax, leprosy, and bubonic plague. Respiratory infections are the most common cause of death from bacteria. Antibiotics are used to treat bacterial infections and are also used in agriculture, resulting in an increase in antibiotic resistance.