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Zymogens, or proenzymes, are enzymes secreted in inactive form. Under certain conditions, a zymogen shifts to the active form of the enzyme. Zymogen secretions in general occur due to the enzyme activity can harm the secretory tissue.
For example, the pepsinogen secreted by the stomach becomes active under acid pH turning into the enzyme pepsin. Other well-known zymogens are trypsinogen and chymotrypsinogen. Enzymes are secreted by the exocrine pancreas and correspondingly trypsin and chymotrypsin.
Prostaglandins Prostaglandins belong to a subclass of lipids known as the eicosanoids because of their structural similarities to the C-20 polyunsaturated fatty acids, t
In a plasma membrane, which of the below provides a general barrier to the movement of molecules? a) Lipids b) Proteins c) Carbohydrates d) all of these Answer: a
methods of isolating and purifying two useful products from microorganisms
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Define Nitrogen Estimation - Kjeldahl's Method? Nitrogen in the protein is estimated by a method referred to as Kjeldahl's method. Although over a period of time many other met
ADOLESCENC E - It is the period of growth from the onset of puberty to the completion of growth & maturity. It extends between 12- 20 yrs. It is a period of rapid physical
Gill slits are the opening or the clefts between the gill arches in the fish. Water taken in by the mouth passes through the gill slits and bathes the gills. It also has rudimenta
The percentage of oxygen absorbed from the air in the lungs is always about the similar, so how can the oxygen supply to the blood be enhanced during vigorous activity? Breathi
Elsie is 75 and enjoys attending the women's Institute and doing volunteer work in a local charity shop for a hospice. She is finding herself forgetting small things, and can't alw
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