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CHEM 210 Module 5 Exam Newest
1. How is the definition of lipid different from protein and carbohydrate?: The
lipid definition is based on the functional definition of being soluble in a non-polar solvent. Proteins and carbohydrates are based on the structure.
- What are three functions of lipids?: Any three of: energy, storage, vitamin,
protection, and insulation
- How does the omega numbering system differ from the simplified nota-
tion?: The simplified notation starts number at the carboxylic acid, while the omega system starts at the opposite end - from the -CH3.
4. What does unsaturated mean for a fatty acid?: Unsaturated indicates that one
or more double bonds are present.
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- What is the difference between a fat and oil?: An oil is a lipid that is a liquid at
room temperature, while fat is a solid at room temperature.
- How are phosphoglycerides similar to triacylglycerols? How they different?-
: similar: Both have glycerol as a backbone structure. Both have fatty acids attached to the glycerol.Differences: phosphoglycerides have two fatty acids attached to the glycerol and, as the name implies, triacylglycerols have three fatty acids. Phosphoglyceride has a polar head group attached.
- What is the primary function of phosphoglycerides mentioned in this mod-
ule?: forming membrane bilayers
8. Describe at least two functions of sphingolipids.: They serve as blood group
determinants, the structure of membrane bilayers, and in the myelin sheath of neurons.
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