Lipids: Lipids are classified not by a particular structure but by the physical property of being water-insoluble. Structural categories of Lipids: 1. Triacylglycerides (fat): The structure of fat consists of 3 fatty acids linked by their carboxylic acid groups to the alcohols of a glycerol molecule. The resultant functional groups are esters. Butter and vegetable oil are examples of fat. The difference in phase (crystalline vs. fluid) is caused by the number of double bonds in the long fatty acid chains. They can be fully saturated (all carbon – carbon single bonds) as in butter or they are unsaturated (1 or more double bonds) as in vegetable oil (always cis double bonds in nature). Look on line to answer this question: Why it is important to see ‘zero trans fats’ on food labels?
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Lipids are a class of organic molecules which includes fats and oils and have the function of long-term storage of energy in the body. The building block of lipids is the fatty acid, which is a chain of carbons with hydrogen attached to each side. Saturated fats have two carbons attached to each carbon (except the one at the end). Saturated fats are unhealthy fats like butter and Crisco. Unsaturated fats are missing at least one hydrogen and are kinked in shape. The unsaturated fats are healthy and include oils. What is the building block of lipids? 2. List the 2 examples of lipids. Describe the structure of a fatty acid. What is saturated fatty acid? Lipids are soluble (dissolve) in oil but are insoluble (do not dissolve) in water. When mixed with water, the lipid will float on top to form a separate layer. To test for the presence of lipids in food, the sample is placed on a piece of brown or newspaper, and then the paper is held up to the light. A positive test for lipids will have an oily spot that is translucent or clear on the paper. What does soluble mean? Explain the solubility of lipids. How would you test for lipids and what is a positive result?
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Lipids are organic molecules that make up fats and oils. These molecules play essential roles in cellular and bodily function. Which functions do lipids serve in humans and other animals? Functions of lipids Although lipids provide many services in the body, having too many of them in your diet can cause problems. Atherosclerosis is a condition in which lipids collect in arteries, creating blockages which inhibit blood flow. These blockages occur because lipids produce damaging chemicals when they are digested. all lipids are solid at body temperature. lipids link up to carrier proteins and tend to get stuck in artery walls. lipids are rarely used by the body as energy. Answer Bank long-term energy storage insulation make up cell walls short-term energy storage make up plasma membranes cushion organs
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