_____________________ аre electiоns where the vоters gо аnd vote individuаlly for who they want to see get nominated by a party.
Sunny аnd Fаir Skin pigmentаtiоn is critically impоrtant as prоtection from the mutagenic properties of UV light. The most serious complication of UV-induced mutations in the skin is an aggressive and unpredictable malignancy; malignant melanoma. The incidence of this potentially fatal malignancy is on the rise in large part due to increased exposure to UV light. Some ethnic groups are at special risk. Julie is active in sports and has always loved the outdoors. Her athletic lifestyle often involves sun exposure and, unfortunately, she has not always been consistent with the use of sunscreen agents that would screen some of the UV light. Most of Julie’s ancestors came from Ireland, and she has the red hair, pale skin, and freckles to prove it. She sunburns easily and has had at least three serious episodes (burns) over the past few years. Several months ago a friend pointed out a brown spot over her right scapula. Since Julie remembered an uncle who had died of malignant melanoma, she decided to have her doctor check the mark. Read the report and answer questions 1 and 2. Julie's Case As soon as the doctor saw the spot, she recommended the lesion be removed. A thorough exam of the rest of Julie’s skin did not reveal any other troubling pigmented spots. Here’s what had worried Julie’s doctor about the original mark: The spot had changed. It was larger than 5 mm in diameter It had irregular borders There was variability in the color The color of our skin, and by extension the dark brown of Julie’s skin lesion, results from the amount of melanin contained in our cells. Melanin is produced by specialized cells of the epithelium known as melanocytes. The amount of melanin produced depends both on heredity and sun exposure. Since the chemical properties of melanin make it a great absorber of UV light, its function is to protect us from the mutagenic effects of UV rays. However, just like any cell in the skin, melanocytes, if subject to ultraviolet (UV) injury, can still undergo malignant transformation. That is what occurred in Julie’s skin lesion. 1) The degree of skin pigmentation of a person is related to _____.
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