Tag Archives | meaning

Brief note on the meaning, structure and function of Nucleus

Robert Brown (1831) discovered nucleus in cells of an orchid. It is the principal organelle of the cell. The membrane-bound nucleus is the most prominent feature of the eucaryotic cells. In prokaryotic cells it is membraneless but performs similar function.

By |2011-06-18T07:25:41+00:00June 18, 2011|Meaning|Comments Off on Brief note on the meaning, structure and function of Nucleus

What do you really mean by Vocuoles?

What do you really mean by Vocuoles? Vacuoles are characteristic of ma­tured plant cells. A young dividing plant cell is generally filled with cyto­plasm and has no vacuoles. Similarly, animal cells have either very small vacuoles or these may be absent.

By |2011-06-18T07:22:07+00:00June 18, 2011|Botany|Comments Off on What do you really mean by Vocuoles?

What do you mean by Microfilament?

What do you mean by Microfilament? Microfilaments are typically smaller than the microtubules. These are thin, cylindrical, elongated struc­tures ranging from 40-80 Å in diameter formed by joining together the mol­ecules of actin, a protein.

By |2011-06-18T07:16:35+00:00June 18, 2011|Meaning|Comments Off on What do you mean by Microfilament?

Notes on the meaning, structure and functions of Lysosome

Notes on the meaning, structure and functions of Lysosome. Lysosomes are membranous vesicles discovered by Belgian biochemist Christian ­de Duve in 1955. Presence of lysosomes in Neurospora, an ascomycetous fungus was reported by P.Matile in 1964.

By |2011-06-17T19:31:56+00:00June 17, 2011|Notes|Comments Off on Notes on the meaning, structure and functions of Lysosome

Notes on the meaning, structure and functions of Golgi complex

Notes on the meaning, structure and functions of Golgi comple. In 1898, Camillo Golgi, an Italian neurobiologist, discovered a reticulate structure in the cytoplasm of nerve cell of an owl. This organelle is known as Golgi complex, Golgi apparatus, Golgi body or dictyosomes.

By |2011-06-17T19:29:51+00:00June 17, 2011|Notes|Comments Off on Notes on the meaning, structure and functions of Golgi complex

Notes on the meaning, structure and functions of Ribosome

Notes on the meaning, structure and functions of Ribosome. Isolated by Palade (1955), ribosomes are the ba¬sophilic granules distributed in the cytoplasm and are rich in RNA. These granular organelles are not enclosed by any membrane.

By |2011-06-17T19:26:13+00:00June 17, 2011|Notes|Comments Off on Notes on the meaning, structure and functions of Ribosome

Notes on the meaning, structure and function of Endoplasmic reticulum

Notes on the meaning, structure and function of Endoplasmic reticulum. Endoplasmic reticulum occurs in all the eucaryotic cells except RBC of mam­mals. It forms an intercommunicating system of channels between nuclear membrane and cell membrane.

By |2011-06-17T19:25:31+00:00June 17, 2011|Notes|Comments Off on Notes on the meaning, structure and function of Endoplasmic reticulum

Notes on the meaning, structure and functions of Plastids

Notes on the meaning, structure and functions of Plastids. Plastids are large cytoplasmic organelles, enclosed by a double membrance. They are mostly found in plants with exception of some lower groups like fungi. Few animals, like protozoan flagellates, also contain these.

By |2011-06-17T19:21:52+00:00June 17, 2011|Notes|Comments Off on Notes on the meaning, structure and functions of Plastids

What do you mean by Totipotency?

What do you mean by Totipotency? According to Haberlandt (1902), a German botanist, every living plant cell is totipotent, i.e., each cell is capable of regenerating a whole plant.

By |2011-06-17T19:05:25+00:00June 17, 2011|Meaning|Comments Off on What do you mean by Totipotency?
Go to Top