Question

What is cell theory? Give details about it.​

Answer 1

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$\small\mathbf\orange{{THE \: CELL \: THEORY }}$

The cell theory states that all biological organisms are composed of cells; cells are the unit of life and all life come from preexisting life. The cell theory is so established today that it forms one of the unifying principles of biology.

The classical cell theory was proposed by Theodor Schwann in 1839. There are three parts to this theory. The first part states that all organisms are made of cells. The second part states that cells are the basic units of life.

Trees in a forest, fish in a river, horseflies on a farm, lemurs in the jungle, reeds in a pond, worms in the soil — all these plants and animals are made of the building blocks we call cells. Like these examples, many living things consist of vast numbers of cells working in concert with one another.

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Answer 2

Explanation:

• The cell theory states that all biological organisms are composed of cells; cells are the unit of life and all life come from preexisting life. The cell theory is so established today that it forms one of the unifying principles of biology.

• Development of CSC Theory
• Development of CSC TheoryCSC Theory originated with a rare gonadal malignancy termed an embryonal carcinoma (EC). As far back as the late 1800s, pathologists had described ECs as a disorganized caricature of the tissues (endoderm, mesoderm, and ectoderm) of an early stage embryo. This led to the postulation that ECs may develop from a pluripotent cell in a parallel fashion to the embryo. By the 1960s, single EC cells (ECCs) had been isolated and shown to be capable of reproducing their original malignancy in xenograft models [11]. By the 1980s, pluripotent ECCs had been developed into what was in effect the first CSC cell culture model [12–16], although the “CSC” term was not used at the time. Cells from a well-differentiated EC termed a “teratocarcinoma” could be maintained in the SR state in culture and readily differentiated by the addition of all-trans retinoic acid (ATRA) [16]. In parallel, bone marrow research had attracted substantial interest following the devastating effects of the 1945 nuclear attacks in Japan.

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