BIOL 112 Lecture Notes - Lecture 10: Tata-Binding Protein, Tata Box, Caat Box
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4 Apr 2016
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Almost all of the cells in your body have the same genes because they were generated from a single cell by mitosis, which of course produces cells that are clones. Yet the cells in different tissues are very different. The reason is that different types of cells express different genes. Your blood cells make hemoglobin which makes them red. Your skin cells don"t, so your skin is not red. Some skin cells produce melanin, the pigment that gives your skin color. However, very few other tissues do, hence the observation that we are all the same color on the inside. Of course, there are genes that all cells must express that are necessary for basic functions of metabolism, transcription etc. These are often referred to as housekeeping genes. In addition to these are the genes that must be expressed to make a liver cell a liver cell, blood cells blood cells etc.
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