Why Do Cancer Fighting Drugs Kill Cancer Cells

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Cells need to be small which means there must be space between them. If the cells get into contact they die. This is called Contact Inhibition; it’s how cancer-fighting drugs kill cancer cells. The purpose of the drugs is to put in the body cells that get in contact with the cancer cells and destroy them. The drugs also prevent DNA replication. The cells are most vulnerable when they are rapidly dividing. Cancer-fighting drugs fall into several different classes.
One of these classes is DNA binding agents. They form a covalent bond with the DNA or stick to it noncovalently very tightly. A covalent bond is a chemical bond. It involves sharing of electron pairs in the middle of atoms. These electron pairs are known as shared pairs or bonding

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