Chemicals of Life by Author: Parul R. Sheth

By Author: Parul R. Sheth

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It is produced from a sterol, a type of chemical compound, when a plant is exposed to ultraviolet light. Another form, cholecalciferol} or vitamin D3, occurs in the tissues of animals, including human beings. Vitamin D has been called the "sunshine vitamin" because it forms in the skin when the body is exposed to sunlight. Liver and fish oils contain much vitamin D2. The natural sources of vitamin D are egg yolk, milk and butter. Dietary vitamin D is absorbed together with fat from the intestine while vitamin D absorbed from the skin slowly diffuses in the blood.

These can bind hormones, and sense other types of signals from the external environment. Most of the properties of cell membranes are reflections of their polar lipid content. There are several classes of lipids and each has a specific/biological function. Fatty acids are the characteristic building- block components of most lipids. Fatty acids are long-chain organic acids having from 4 to 24 Fatty acids . Hydrophobic tail Hydrophilic head, Water ..... : Lipids are oily and water insoluble 42 Chemicals of life carbon atoms.

Maltose or malt sugar remains after the brewing process. It is used to flavour some sweets. A molecule of n1altose consists of two molecules of glucose. Polysaccharides consist of long chains having hundreds or thousands of monosaccharide units. Some polysaccharides such as cellulose have single chains whereas others such as glycogen have branched chains. The most abundant polysaccharides are starch, glycogen and cellulose of the plant world. A molecule of starch consists of hundreds or even thousands of glucose molecules joined end to end.

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