Question

A short and easy answer for - Write a short note on bacteria , algae , protozoa and viruses.(In points).

Answer 1

Bacteria
Among living organisms, microorganisms are the third domain of classification. This domain includes every unicellular and multicellular microbe like bacteria, protozoa, viruses and so on. Bacteria are inquisitive species for scientist due to many characteristics. They have a long term mutual relationship with humans which are somewhat complex. At times it becomes fatal for other life forms.

Algae
Algae is a kind of a photosynthetic organism, which is usually grown in the moist areas. These are usually the simple plants that grow near to the water bodies. It contains a kind of chlorophyll pigments that act as a primary coloring agent. Generally, it comes in the form of aquatic and autotropic with different cell types and tissues.

Protozoa
Unicellular or acellular, eukaryotic and com­monly motile heterotrophic organisms are called Protozoa. Protozoans are usually microscopic and unicellular individuals. They exhibit all types of symmetry. Most species occur as single but many are colonial. Body is bounded by a cell membrane or plasmalemma

Virus
A virus is an infectious parasite that can reproduce by itself in living cells of bacteria, plants and animals, whose name originates from a latin word that means poison or slimy liquid. Once a susceptible cell is infected, a virus can start the cell machinery to generate more viruses. Many viruses have either DNA or RNA as a genetic element. The nucleic acid can have single or double strands. The whole infectious virus, called as virion has nucleic acid and an outer shell of protein. The most simple virus includes only enough DNA or RNA for encoding four proteins and the most complex encodes 100-200 proteins.