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TEAM 4: Population Genetics of Lactose fanaticism A. Biochemistry: Enzyme-Substrate The draw produced by charitable mammary glands contains about the said(prenominal) parcel of fat and less protein than cows draw, but it has more lolly than that of other(a) mammals. This carbohydrate is in the form of milk sugar, a disaccharide. mammalian infants see on their mothers milk for nourishment and immunological protection. As a fresh, temperature-controlled, uncontaminated food source, the milk from mothers breast is the better at meeting the needs of the infant. Except for certain populations of westbound humans, milk consumption stops (or is greatly reduced) with weaning. It also happens that in animals and approximately humans there is a decline in the train of production of lactase with aging. Lactase is the enzyme that digests milk scribble. The hydrolysis (breakdown) of the milk sugar sugar by lactase is described be commencement: [pic] B. Symptoms: most(prenominal) human infants produce ample quantities of lactase for milk digestion. However, in the huge majority of adult humans, the gene which specifies production of lactase is glowering off and these individuals earth-closetnot digest milk sugar - they ar lactose intolerant. Symptoms of lactose intolerance include cramps and diarrhea.

It goes like this: The lactose molecule, which is gargantuan, accumulates in the large intestine and affects the osmotic balance there. Since water moves crosswise semipermeable membranes, such as the intestine, from areas of high concentration to low concen tration, the accompaniment of large lactose! molecules causes water to enter the intestine. This can government issue in the very unpleasant image of watery canful or diarrhea. Since lactose is a sugar, it is an sublime food for the bacterium which normally inhabit our intestine (and are essential to digestion). However, the lactose will be fermented by these same friendly bacteria, and organic fertilizer acids which are gases, are produced by them. And we all know what tenderness intestinal...If you want to get a full essay, order it on our website: OrderCustomPaper.com

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