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Define Role in growth and cellular Differentiation?
The growth and differentiation of epithelial cells throughout the body are especially affected by vitamin A deficiency. In addition, goblet cell numbers we reduced in epithelial tissues and as a consequence, mucous secretions diminish. Cells lining protective tissue surfaces fail to regenerate and differentiate; hence they flatten and accumulate keratin. Classical symptoms of xerosis (drying or non-wet ability) and desquamation of dead surface cells as seen in ocular tissue (i.e. xerophthalmia) are the external evidence of the changes also occurring to various degrees in internal epithelial tissues. Current understanding of the mechanism of vitamin A action within cells outside the visual cycle is that cellular functions are mediated through specific nuclear receptors. Binding with specific isomers of retinoic acid (i.e.all Tran- and 9-cis-retinoic acid) activates these receptors. Activated receptors bind to DNA response elements located upstream of specific genes to regulate the level of expression of those genes. These retinoid-activated genes regulate the synthesis of a large number of proteins vital to maintaining normal physiologic functions. There may, however be other mechanisms of action that are as yet undiscovered.
How are the symmetry and the nervous system characterized in echinoderms? Adult echinoderms, with cnidarians, are the animals that present radial symmetry, i.e., their body str
Q. How different are the concepts of action potential, resting potential and excitation threshold concerning neurons? Action potential is the maximum positive voltage level ach
Is heart patient can do exercise Advise the patient to consult the doctor before starting any exercise. Doctor will advise the patient to choose exercises as per his condition;
Prothoracic Gland or PTC Prothoracic gland (PTC) or moulting gland and ecdysone or moulting hormone The 3 rd endocrine gland-prothoracic gland- is an irregular branching
If water dousing, homeopathic cures, and so on work for just me but not for anyone else, it is still science.
HOW ARE THE ORIGIN AND EVOLUTION OF ALGAE..
Shift of the phosphate group from carbon 3 to carbon 2 Shift of thephosphate group form carbon 3 to carbon 2: This reversible reaction is catalyzed by phosphoglycerate mutas
Digestion of Nucleic Acids Several nucleases present in the pancreatic juice like RNAase and DNAase digest various nucleic acids- These enzymes are endonucleases which h
Cellulose is a polysaccharide which is composed of the unbranched chains of glucose; the major structural carbohydrate of the plants, insoluble in water, and indigestible in the h
Define Larval Stage of Taenia Cystcercus? The pork tapeworn (T: solium) and beef tapeworn (T : saginata , which are endoparasites of humans who are the final hosts
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