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Homework 1 - organophosphate poisoning(5 points...

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Due Oct. 8 ‘09 Biology 301 Home Work # 1 Fall 2009 Katherine McLean 0008 Name Lab Section number The answers cannot be more than 4 lines. They must be written in a scientific language. Longer answers will be penalized by point deductions . 1. Cancer is abnormal, uncontrolled cell division. What property of epithelial tissues might (and does) make them more prone to developing cancer? ( 5 points) Epithelial tissues are more prone to developing cancer because epithelial tissue cells rapidly divide. This fast reproduction rate unfortunately is great for cancer cells to continue their uncontrolled cell division in the epithelial tissue, which covers the body and lines the cavities. 2. Many potent insecticides contain toxins called organophosphates. Ivan is using such an insecticide and is very careless. Because he does not use gloves or a dust mask he absorbs some of the chemicals through his skin and inhales a large amount as well. What signs would you expect to observe in Ivan as a result of
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Unformatted text preview: organophosphate poisoning? (5 points) Organophosphates inhibits acetylchloinesterase in nerve cells. As a result, acetylcholine concentration increases in the region of the end plate. This causes muscle spasm and could lead to death by laryngeal spasm. Stomach cramps, sweating, diarrhea, pupils decreasing in diameter, and unconsciousness may also all result. 3. Many people change the natural appearance of their hair, by coloring it. Which layers of the hair do you suppose are affected by the chemicals added during these procedures? Why are the effects of the procedures not permanent? (5 points) The cuticle, the outer layer of the hair shaft, allows hair dye to pass into and react with the cortex. The melanin is decolorized and replaced with the new color. This colorant bonds within the hair shaft. This is not permanent because the cells rapidly divide; the new melanin pushes out the hair shaft, replacing the decolorized melanin....
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