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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.
Exceptions to the Cell Theory Viruses, however, are not the only exception to the Cell Theory as formulated earlier. This has led scientists to take a much broader view of the
Q. What do you mean by Hemichordata ? Hemichordates re vermiform (worm-like) animals which have few characters like those of the chordates, hence the name hemichordata (hemi :
Structure of the Vascular Cambium This meristem, in the anatomical sense of the term usually includes two histologically distinct kinds of cells: i) Fusiform Initials, i
Q. How do bones grow? Bones form and develop through a process known as ossification. There are two types of ossification: endochondral ossification and intramembranous ossific
Biota of Littoral Zone This zone is the shore region of the marine ecosystems and is subject to violence of waves and tides, fluctuation of water level and variability of temp
Action of carbon dioxide receptor cells The respiratory center is sensitive to increased carbon dioxide levels and increased acidity of the blood. It is peculiar that even tho
a) Describe with the help of a suitable example for each of the following terms : (i) morphallaxis (ii) epimorphosis and (iii) compensatory regeneration.
Q. What are cerebrovascular accidents? The Cerebrovascular accident (CVA), as well known as stroke, is the generic name given to infarction (tissue and cellular death by hypoxi
Biosphere Biosphere is that part of the earth where life can exist. It is a narfqy layer around the surface of the earth. If you visualise the earth to be the size of an apple
Explain Beef Extract and Yeast Extract These are aqueous extracts of lean beef and brewer's yeast, respectively. Beef extract provides amino acids, peptides, nucleotides, organ
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