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Causes of Cancer
Scientists have identified the cellular genes that code for those proteins which jointly control and regulate cell growth and division. These genes are of two broad categories proto oncogenes and tumor supprerssor genes. Any change i.e. mutations in these genesparticularly in the proto oncogenes, shatters the cellular controls over growth and division rendering the concerned cells carcinogenic. A mutated proto oncogene is called oncogene.
Mutations in proto oncogenes and other related genes may occur spontaneously due to a variety of factors originating in the cells themselves. These may also occur due to physiological disorders in the body beside this, certain external environmental factors have alsobeen indentified as carcinogenic mutagens. It has been found that incidence of cancer increases in a population exposed to ionizing radiations (X-rays, gamma rays and ultlraviolet rays ) and certain chemicals such as those present in chimney smoke. Chemical present in cigarette smoke such as vinyle chloride, benzopyrenes and nitro so nor nicotine, are known to cause lung cancer.
Approximate Composition of Human Tissue Table gives the approximate composition of human tissue. We all know that carbon, oxygen, hydrogen are present in water and other organ
Bi-and Poly-Functional Enzymes These enzymes are generated by genes obtained by fusion of the coding regions of two or more genes encoding various enzymes. In simple words, the
All of the following make meiosis different from mitosis, EXCEPT A. Meiosis comprises two separate divisions. B. Meiosis only occurs during embryonic development. C. Chromosome num
Characteristics
Sally Subcloner wants to clone a fragment into pUC19 (Map above - From New England Biolabs). Her fragment was a protein coding gene of 2.7 kb, and had Xho I sites on either end (a
Determine some Food Sources for Copper? Foods containing more than 1 mg copper per 1000 kilocalories are considered high in copper and include green leafy vegetables, nuts, leg
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Post removal Technique using PRS kit -Transmetal efficiently doming the post head . -Select suitable sized trephine . -Place drop of RC prep on the post head as lubrican
Characteristic of Callus The most important characteristic of callus from a functional view point is that abnormal growth has the potential to develop normal roots, shoots and
Reparative Regeneration This type of regeneration, as the name suggests, involves repair of a wound or replacement of a body part removed intentionally or because of injury.
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