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features animations and activities for learning about DNA, cells, and other topics in genetics and bioscience. Build a DNA molecule. Transcribe and translate a gene. See why a firefly's tail glows. Use DNA evidence to solve a mystery. Extract DNA from wheat germ and see real DNA. Find out how genetics are being used to save endangered species. Learn about stem cells, addiction, gene therapy, cloning, and genetically modified food. (University of Utah, National Institutes of Health)
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Circadian rhythms are controlled by "clock genes" that carry the genetic instructions to produce proteins. The levels of these proteins rise and fall in rhythmic patterns. These oscillating biochemical signals control various functions, including when we sleep and rest, and when we are awake and active. |
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The other brain cells |
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