The Cyanobacteria are the largest and most diverse group of photosynthetic bacteria. They were previously known as blue green algae. They show following characteristics: Cell type: They are true prokaryotes.…
There are following groups of bacteria Archeobacteria: They are most primitive organism on the earth. The lack peptidoglycan in their cell wall. The live in the deep sediments of oceans.…
Bacterial Reproduction Both asexual and sexual reproduction occurs in bacteria. Asexual reproduction Asexual reproduction in bacteria occurs by binary fission. It occurs during favourable conditions. The size of bacteria becomes…
(I) Cell Membrane Cell membrane or plasma membrane is present beneath the cell wall. It is very thin and flexible. It completely surrounds the cytoplasm. Chemically, it is composed of…
Flagella are extremely thin hair like appendages. They originate from basal body and come out through cell wall. The basal bodies are present just beneath the cell membrane in the…
Fig: A generalized bacterial cell GENERAL STRUCTURE OF BACTERIA Bacteria are unicellular prokaryotes. They lack true nucleus and other membranous bound organdies. Some species form colonies. Most prokaryotic have…
TERMS - DEFINITIONS Capsid The proteinshell thatenclosesthe viral genome is called a capsid. Capsomeres Capsids are built from a large number of protein subunits called capsomeres. Retroviruses The…
Virus causes different diseases in animal and plants. Viral Diseases in Animals Virus does not produce symptoms directly in the animals (humans). But it indirectly affects the host. I. Some…
Viruses are obligate intracellular parasite. They are reproduced only within a host cell. Viruses lack the enzyme for its replication. It uses the metabolic machinery of the host for its…
PHYLUM: VIRA All viruses are belonged this phylum. It has two sub-phyla: Sub-Phylum: Deoxyhelica The sub-phylum includes viruses with DNA core. It has three classes. (i) Class Deoxyhelica: This class…
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