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Saturday, September 18, 2010

Gene Modulation

Not all genes are always active because it takes energy to express them; for example, if one doesn't eat lactose, the body will stop making lactase (the enzyme that digests lactose) because it takes energy to make lactase1. Endogenous enzymes are assembled from amino acids as per the genetic code for its assembly by cells' ribosomes.

It is a well-known biological fact that chromosomes' genes change in expression as per environmental changes. The brain is the body's primary means for apprehending its environment.

1Ridley, M. (1999). Genome: the autobiography of a species in 23 chapters. New York: HarperCollins.

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