in plants and it is the most abundant organic substance in plant kingdom. It is a predominant constituent of cell wall of plant cells. Cellulose is a straight chain polysaccharide composed only of b -D-glucose units which are joined by glycosidic linkage between C1 of one glucose unit and C4 of the next glucose unit. (iii) Glycogen : The carbohydrates are stored in animal body as glycogen.
It is also known as animal starch because its structure is similar to amylopectin and is rather more highly branched. It is present in liver, muscles and brain. When the body needs glucose, enzymes break the glycogen down to glucose. Glycogen is also found in yeast and fungi.
Carbohydrates are essential for life in both plants and animals. They form a major portion of our food. Honey has been used for a long time as an instant source of energy by ‘ Vaids ’ in ayurvedic system of medicine. Carbohydrates are used as storage molecules as starch in plants and glycogen in animals.
Cell wall of bacteria and plants is made up of cellulose. We build furniture, etc. from cellulose in the form . .
Importance of Carbohydrates of wood and clothe ourselves with cellulose in the form of cotton fibre. They provide raw materials for many important industries like textiles, paper, lacquers and breweries. Two aldopentoses viz. D-ribose and -deoxy-D-ribose (Section .
. , Class XII) are present in nucleic acids. Carbohydrates are found in biosystem in combination with many proteins and lipids. .
Glucose or sucrose are soluble in water but cyclohexane or benzene (simple six membered ring compounds) are insoluble in water. Explain. . What are the expected products of hydrolysis of lactose?
. How do you explain the absence of aldehyde group in the pentaacetate of D-glucose? Proteins are the most abundant biomolecules of the living system. Chief sources of proteins are milk, cheese, pulses, peanuts, fish, meat, etc.
They occur in every part of the body and form the fundamental basis of structure and functions of life. They are also required for growth and maintenance of body. The word protein