the cell theory living things

The theory was originally proposed by Dixon and Jolly (1894) and supported by Renner (1911 to 1915), Curtis and Clark (1951), Benner and Golston (1952) Kramer and Kozlowski (1960). The features on which the theory is based are: Water is lost from the surface of the mesophyl..

The word organelles (Latin: organas=instrument) is used to describe the living structures inside the cytoplasm, having definite shape, structure and function..

Electrochemical Cells - The fact that chemical reactions produce electrical effects was discovered accidentally in 1791 by Luigi Galwani, professor of anatomy at the University of Bologna, Italy. He found that an electric current flowed across two dissimilar metals between which was a moi..

According to this theory, damage to mechanisms that synthesise proteins, results in faulty proteins, which accumulate to a level that causes catastrophic damage to cells, tissues and orga..

This was proposed by Weismann who did not agree with Lamarck's theory of inheritance of acquired characters. To prove his point, he cut off the tails of many successive generations of mice. This resulted in forced disuse of the tail. According to the theory of use and disuse, t..

Cell Organelles - The word organelles (Latin: organas=instrument) is used to describe the living structures inside the cytoplasm, having definite shape, structure and functions. The various cell organelles in a cell can be broadly classified into the followin..

According to this theory, ageing is the result of the sequential switching on and off of certain given, with senescence. T- lymphocytes or B - lymphocytes have the receptors for self-antigens by which they undergo programmed cell death or apoptosis, thus reducing their numbe..

According to this theory, accumulated damage caused by oxygen radicals causes cells to stop functioning and eventually organs also stop functioning. An oxygen free radical is a by-product of normal metabolism produced when cells turn food and oxygen into energy. This f..

This theory assumed that living organisms could arise suddenly and spontaneously from any kind of non-living matter. One of the firm believers in spontaneous generation was Aristotle, the Greek philosopher (384-322 BC). He believed that dead leaves falling from a tree ..

Each cell whether in a unicellular form like Gleocapsa or multicellular form like Nostoc, has a definite cell wall. Most often it is surrounded by a thin or thick mucilagenous sheath. The inner layer of cell wall has a chemical composition similar to bacterial cel..