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**13.3 Lipids Are Insoluble in Water ** __ipids- __ broad class of miomolecules. __fat- __ any biomolecule formed from the reaction between a glycerol molecule. //Two important types of lipids: fats and steroids. // A fatty acid is a long-chain hydrocarbon termination in a carboxylic acid group. The chain is typically between 12 and 18 carbon atoms long and may be either saturated or unsaturated. A saturated chain contains no carbon-carbon double bonds, and unsaturated chain contains one, two, or three carbon-double bonds. <span style="background-color: transparent; color: #000000; font-family: Times New Roman; font-size: 18px; text-align: left; text-decoration: none; vertical-align: auto;">Since fats are made from three faty acids and glycerol, they are commonly referred to as triglycerides. <span style="background-color: transparent; color: #000000; display: block; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;"><span style="background-color: transparent; color: #810081; font-family: Times New Roman; font-size: 18px; text-align: left; text-decoration: underline; vertical-align: auto;">two <span style="background-color: transparent; color: #000000; display: block; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;"><span style="background-color: transparent; color: #000000; font-family: Times New Roman; font-size: 18px; text-align: left; text-decoration: none; vertical-align: auto;">The walrus and other polar species are insulted from the cold by a thick layer of fat beneath their skin. >>
 * < <span style="background-color: transparent; color: #000000; display: block; font-family: Times New Roman; font-size: 18px; text-align: left; text-decoration: none; vertical-align: auto;">[[image:walrus.jpg width="396" height="332" caption="http://www.itsnature.org/ice/above-the-ice/walrus/"]] ||
 * < <span style="background-color: transparent; color: #000000; display: block; font-family: Times New Roman; font-size: 18px; text-align: left; text-decoration: none; vertical-align: auto;">http://www.itsnature.org/ice/above-the-ice/walrus/ ||
 * < <span style="background-color: transparent; color: #000000; display: block; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;">__<span style="background-color: transparent; color: #000000; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: underline; vertical-align: auto;">LIPIDS __ <span style="background-color: transparent; color: #000000; display: block; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;">**<span style="background-color: transparent; color: #000000; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;">Fats ** <span style="background-color: transparent; color: #000000; display: block; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;">//<span style="background-color: transparent; color: #000000; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;">Saturated // <span style="background-color: transparent; color: #000000; display: block; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;">Coconut ||< <span style="background-color: transparent; color: #000000; display: block; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;">**<span style="background-color: transparent; color: #000000; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;">Steroids ** <span style="background-color: transparent; color: #000000; display: block; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;">Chikesterol <span style="background-color: transparent; color: #000000; display: block; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;">Testosterone <span style="background-color: transparent; color: #000000; display: block; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;">//<span style="background-color: transparent; color: #000000; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;">Estradiol // <span style="background-color: transparent; color: #000000; display: block; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;">//<span style="background-color: transparent; color: #000000; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;">Unsaturated // <span style="background-color: transparent; color: #000000; display: block; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;">Olive ||