NEET BIOLOGY

Detailed explanation-1: -Bacteria are free-living cells that can live inside or outside a body. Bacteria are prokaryotes-the smallest, simplest and most ancient cells, with free-floating genetic material. These microscopic single-celled organisms can be rod, spiral or spherical in shape.

Detailed explanation-2: -Living or Not Bacteria, on the other hand, are living organisms that consist of single cell that can generate energy, make its own food, move, and reproduce (typically by binary fission).

Detailed explanation-3: -The authors concluded that viruses originated in ‘proto-virocells’ that were cellular in nature and they implied that viruses and modern bacteria evolved from common ancestors. They further claim that this means that viruses are indeed living organisms.

Detailed explanation-4: -Bacteria are found in every habitat on Earth: soil, rock, oceans and even arctic snow. Some live in or on other organisms including plants and animals including humans. There are approximately 10 times as many bacterial cells as human cells in the human body.

Detailed explanation-5: -Once regarded as plants constituting the class Schizomycetes ("fission fungi"), bacteria are now classified as prokaryotes.