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Cancer 2 - School Essays

Cancer 2

The individual unruly cell that has escaped the normal regulatory control mechanisms is the basic unit of cancer.
Inside the nucleus is a substance called DNA, which contains genetic information for the body, organized in units called genes. These genes contain the complete plans for the body. They determine weather you have a blue or a green eye, weather you will have two or four legs, etc. They send out information that tells the cell what chemicals to make, as well as how much and when to make them.
In nucleus, genes are joined together, like beads on a chain, into structures called chromosomes. A normal human body cell has 46 chromosomes, which contain an average of several thousand ...

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of the chromosomes-hereditary regions where the DNA molecule may break or its portions may be rearranged into new combinations. Actually most of the times, the nucleus and the DNA are constantly exposed to substances that may alter the genes. But these alterations are almost always prepared by intricate mechanism with the function of preventing havoc in the cell. But if these changes persist in a given cell, that altered gene will breed true. Such damage to the chromosome may remove the oncogene from the influence of the genetic control mechanisms that normally govern its actions or an inactive oncogene may remove next to another gene that has an activating affect. This way the DNA in the cell is changed to activate the oncogenes. Instead of sending out the signals for normal growth and development, oncogenes carry instructions that cause cells to grow and divide more rapidly than normal cells - Researchers have found that when the cell membranes of two normal cells touch each ...

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PAPER DETAILS

Added: 4/27/2005 07:03:45 AM
Category: Science & Nature
Type: Free Paper
Words: 1077
Pages: 4

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