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The term cell was first used by an English cytologist, Robert Hooke (1665) not for unit protoplasmic masses, but for the well defined and empty compartments, he observed in a thin slice of cork under his self invented microscope. This finding of Hooke was cork is a dead and dry plant material. Obviously, what Hooke actually observed were empty cells with cellulose walls originally produced by the living cells they surrounded, yet the term cell has since been retained and universally adopted for unit protoplasmic masses of live organisms.
Leeuwenhoek (1674-76) discovered free living cells. He also observed the presence of a distinct central structure in certain unicellular organisms and some cells of multicellular organisms. Robert brown (1831) discovered that a central structure is an essential is an essential part of all living cells. He named it as nucleus first observed the jelly like protoplasm in living cells and termed it arcade. When observation upon varied types of cells and unicellular organisms many scientists during17th and 18th centuries were leading to the realization that plants and animals were made up of component cells. Two German biology Matthias j Schleiden and Theodor Schwann (1938-39) separately formulated. Famous cell theory stating that cells are the basic structural and functional unit or building blocks of the bodies of all organisms, like the bricks of house. Thus this cell theory came as the most fundamental biological generalization implying a common pattern of body architecture in all living beings.
Distinguish between epithelial and connective tissues with respect to their cell arrangement? PROVIDE a specific example( for both tissue types) of how the arrangement of cells hel
How can amine groups be classified? Amines can be classify into primary amines, those to which one -R (variable radical) is attached to a -NH2, secondary amines, those where on
Ed e m a It refers to excessive accumulation of fluid in tissue spaces caused by disturbance in the fluid interchange between capillaries, tissue spaces and lymphatic vessel
Problem of Polarity in Regeneration in Planarians As in Hydra, flatworm regeneration as well appears to occur in a polar fashion. There seems to be ananterior-posterior gradie
Cleavage of fructose-1,6-bisphosphate Aldolase cleaves fructose-1, 6-bisphosphate to dihydroxyacetone phosphate and glyceraldehyde-3-phosphate in the reversible reaction.
HISTORICA L REVIEW Anoximander (600 B.C.) was the first western philospher who proposed the idea that "living creatures arose from the moist element". Empedocles (500 B.
Explain the Oligosaccharides (DP: 3-9) - carbohydrates? Oligosaccharides consists of short chains of monosaccharide units joined by covalent bonds. The glycosidic bond may be α
Q. What is the valve that separates the aorta from the heart? What is the importance of that valve? The valve between the aorta and the left ventricle is the aortic valve. The
Polyembryony Presence of more than one embryo in a seed is termed polyembryony. The phenomenon, first discovered in orange seeds by Leeuwenhoek (1719), attracted considerable
SEXUA L REPRODUCTION 1 . Amphigony - Zygote is formed. (i) Syngamy Fusion of gametes. (a) Endogamy - It involves self fertilisation. e.g.
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