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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.
What is biotechnology? Biotechnology is the application of biological knowledge to get new techniques, materials and compounds of pharmaceutical, medical, agrarian, industrial
Define the Soybean Protein Isolates? Soy protein isolates are the most pure and refined soy protein available. Isolated soybean proteins (ISP), or soybean protein isolates, are
two main evolutionary novelties presented by annelids
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Define Water as a temperature regulator? Water plays an important role in the distribution of heat throughout the body and the regulation of body temperature. Heat is generate
Describe the Capillarity Theory in respect of ascent of water in plants. Name the tissue included. Determine the initiation of muscle contraction. What is the role of Sarcoplas
a) What is biological magnification? b) Describe how DDT as a water pollutant undergoes biological magnification?
Define Some Example of Acidic and Basic Buffer? Frequently used example of acidic and basic buffer includes: - Acidic buffer: a mixture of CH 3 COOH (acetic acid) + CH 3 C
Explain the Glycemic index in Chronic Diseases? In addition to serve as an aid in planning diets for diabetics, GI of diets has been linked to a number of chronic diseases. Sev
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