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Cholesterol, from stereos (solid) and the Greek chole- (bile) followed by the chemical suffix -ol for an alcohol is an organic chemical substance classified as a waxy steroid of fat. It is an necessary structural element of mammalian cell membranes and is requires to built proper fluidity and membrane permeability
Additionally to its significance within cells and cholesterol also serves as a precursor for the biosynthesis of bile acids and steroid hormones and vitamin D. That is the principal sterol synthesized by animals; in vertebrates it is establish predominantly in the liver. Little quantities are synthesized in other cellular organisms (eukaryotes) such as fungi and plants. It is almost completely absent among prokaryotes like bacteria.
Which are the glands present in the epidermis of mammals, birds and reptiles? In the epidermis of birds and reptiles there are almost no glands. In mammals there are sweat glan
a) Explain what is meant by ovulation. b) How often does it happen in humans? (a) Ovulation is the release of an ovum from a mature follicle in the ovary.
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Define senescence Explain the 'programmed senescence theory' of ageing.
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How would you design, in principle, an experiment to test the hypothesis that a particular variety of lettuce seed required daylight in order to germinate You would requi
How might the destruction of large areas of tropical rain forest have world-wide consequences? As plants consume CO 2 during photosynthesis, extensive deforestation could resu
What are the lateral meristems? Where can they be found and which kind of plant growth do they promote? The Lateral or the secondary, meristems, are the cambium and the phellog
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