Lipid

-Lipid
Lipid are diverse group of chemical. The most common type are the triglycerides, which are usually known as fats and oils.
 o Triglycerides
Triglycerides are made out of three fatty acid
and one glycerol molecule, Triglyceride are
insoluble in water but soluble in certain
organic soluvents
 o Saturated and unsaturated fatty acid and lipid
Fatty acid that have double bond between neighboring carbon atom like -C=C-. Such fatty acid are describe as unsaturated (as they do not contain the maximum possible amount of hydrogen) and form unsaturated lipids, animal lipid are often saturated and accruing as fats.

Biological Molecule -Polysaccharide-

-Polysaccharide
Polysaccharide are polymers whose submit are monosaccharide. They made by joining many monosaccharide molecule by condensation. Each successive monosaccharide is added by means of a glycosidic bond or disaccharides. The most important polysaccharides are starch, glycogen and cellulose, all which are polymer of glucose, polysaccharide are not sugar. Glucose is also a reactive molecule and would interfere with normal cell. These problem are avoided by converting glucose, by condensation reaction to a storage pollysaccharide. The storage polysaccharide formed is starch in plant and glycogen in animal.
 o Starch and glycogen
starch is a mixture of amylose and amylopectin. Amylose is made by condensation between alpha-glucose. starch is never found in animal cells, a substance with molecule very like those of amylopectin is used as the storage carbohydrate, and this is called glycogen.
 o Cellulose
Cellulose is the most abundant organic on the planet, due to its presence in plant cell walls and its slow rate of breakdown in nature, cellulose is a polymer of beta-glucose and alpha-glucose.