Lipids PDF

LIPIDS  Defined by low solubility in water NO polymers Most biologically important – fats, phospholipids and steroids One molecule of fat What makes them healthy/unhealthy  Besides getting us overweight, what are the crucial functions of fats? The average human body conta...

LIPIDS  Defined by low solubility in water NO polymers Most biologically important – fats, phospholipids and steroids One molecule of fat What makes them healthy/unhealthy  Besides getting us overweight, what are the crucial functions of fats? The average human body contains between 10 billion and 30 billion fat cells, and they are yours forever. When you lose weight, you are letting some of the stuff out of the inflated balloons, thus shrinking the fat cells. You can shrink them all the way down until they're practically empty, but they will always be there—waiting to be refilled, haunting your chubby nightmares. PHOSPHOLIPIDS  Steroids Steroids are a family of lipids found in plants and animal – A steroid contains four fused carbon ring: 17 carbon atoms make the structural unit of steroids known as steroid nucleus. – Steroid nucleus is found in a number of extremely important biological molecules: cholesterol, adrenocorticoid hormones, the sex hormone and bile acids. Cholestorol (membrane sterol) Cortisol, C21, an adrenocortical hormone provides control of carbohydrate, protein, and lipid metabolism. Progesterone, C21, is a precursor of testosterone and estradiol. Testosterone, C19, is the primary male sex steroid hormone. Estradiol, C18, is the primary female sex steroid hormone. The structures of several important sterols derived from cholesterol.  Wax Waxes consist of long-chain alcohols esterified to long-chain fatty acids. Triacontanol palmitate is the principal component of beeswax. Wax