B M B 211 Lecture Notes - Lecture 13: Very Low-Density Lipoprotein, Arteriosclerosis, Low-Density Lipoprotein
16 Nov 2016
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Document Summary
The american heart association recommends that fat intake be 30% of daily calories. 7% or less should come from saturated fat. Lipids: the group of biological macromolecules that have a major hydrocarbon component and are mostly nonpolar and hydrophobic. Structures and functions of lipids are very diverse. Steroids: members of the isoprenoid family and are a derivative of triterpene with four fused rings, the body uses cholesterol to make all of the steroids we need. Cholesterol is important for membranes, especially in keeping the membrane fluid. Without cholesterol, membranes become stiff and can pack together. Cholesterol is the precursor in the biosynthesis of all steroid hormones. We cannot break down cholesterol; it will be used to make steroids. Three six carbon rings and a five carbon ring is the backbone of all steroids. Fat: also known as triacylglycerol or triglyceride, is a glycerol linked to 3 fatty acids.
