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Lactase persistence or lactose tolerance is the continued activity of the lactase enzyme in adulthood, allowing the digestion of lactose in milk.In most mammals, the activity of the enzyme is dramatically reduced after weaning. [1]
However, most people worldwide remain lactase non-persistent. [9] Populations that raised animals not used for milk tend to have 90–100 percent of a lactose intolerant rate. [80] For this reason, lactase persistence is of some interest to the fields of anthropology, human genetics, and archaeology, which typically use the genetically derived ...
Lactase (EC 3.2.1.108) is an enzyme produced by many organisms and is essential to the complete digestion of whole milk.It breaks down the sugar lactose into its component parts, galactose and glucose.
The majority of humans actually follow this protocol as well, and down-regulate lactase production around 3-5 years of age. Interestingly, though, the majority of caucasians, mainly those from northern european background, continue to have elevated lactase activity all the way into adulthood, and so they exhibit “lactase persistence”.
The statement "Among mammals, lactase persistence is unique to humans –" at Lactase persistence needs strong support. Southern US farm families for generations had domesticated cats which were strongly attracted to dairy milk and routinely drank milk daily. I have never seen a cat get sick from drinking milk; perhaps they do - again it needs ...
In 2004 he led a study to show that most lactase persistent Africans did not have the same mutation causing it as Europeans. [8] In 2007, in collaboration with Joachim Burger 's group in Mainz, Germany, he showed that the genetic variant that causes lactase persistence in most Europeans (-13,910*T) was rare or absent in early farmers from ...
Boris Karloff in James Whale's 1931 film Frankenstein, based on Mary Shelley's 1818 novel.The monster is created by an unorthodox biology experiment.. Biology appears in fiction, especially but not only in science fiction, both in the shape of real aspects of the science, used as themes or plot devices, and in the form of fictional elements, whether fictional extensions or applications of ...
Lactose synthase is an enzyme that generates lactose from glucose and UDP-galactose.. It is classified under EC 2.4.1.22.. It consists of N-acetyllactosamine synthase and alpha-lactalbumin.