Biological Classification: Lower Organisms

RH Whittaker divided living organisms into five kingdoms. Out of these, Monera include prokaryotes(bacteria, archaebacteria and cyanobacteria.

Gram positive bacteria retains the purple colour of the crystal violet stain. This retention is facilitated by the thick peptidoglycan layer in their cell wall.

A fine, filamentous appendage found on the cell surface of many gram-negative bacteria, shorter, thinner and straighter than flagella

The genetic material in both of them is known as nucleoid

fact

Monera includes all bacteria which are unicellular prokaryotic cells.

KCl is a salt.

fact

Red tide is a common name for a phenomenon more correctly known as an algal bloom (large concentrations ofmicroorganisms), an event in which estuarine, marine, or fresh water algae accumulate rapidly in the watercolumn and results in discoloration of the surface water. It is usually found in coastal areas. Gymnodinium is agenus of dinoflagellates

The ability of some cells, esp. protozoans, to alter their shape

Rhizopus is fungi.

Frederick W. Twort

fact

Sporozoites are the infective stage of malarial parasite. They are present in the saliva of infected femaleAnopheles mosquito. This infective stage is directly goes to parenchyma cells of liver.

An obligate parasite is a parasitic organism that cannot live independently of its host

fact

Simian virus 40

It is also called Baker's yeast.

Agrobacterium tumefaciens (updated scientific name: Rhizobium radiobacter) is the causal agent of crown gall disease (the formationof tumours)

fact