Biological Molecules Lipids: Composition, structure, and function by Nathan H Lents, Ph.D., Lizzie Stark, M.S./M.F.A, Bonnie Denmark, M.A./M.S. Reading Quiz Teach with this 1. Some functions of lipids include water-proofing, temperature regulation, and long-term energy storage. Which of the following is NOT a common type of lipids? Fats Oils Sugars Waxes 2. Oil and water don't mix because water has polar bonds while oils have nonpolar bonds. true false 3. Which of the following is the best explanation for why soaps can dissolve oily substances? The hydrocarbon tails of soap are nonpolar so, they are soluble in oil. The hydrocarbon tails of soap are polar so they are soluble in oil. The charged groups in soap are polar so they are soluble in water. The charged groups in soap are nonpolar, so they are soluble in oil. 4. Soap was invented during the Industrial Revolution of the 1800s. true false 5. Unsaturated lipids are generally liquid at room temperature because their hydrocarbons are _____________ packed because of their ____________ bonds. tightly; double tightly; single loosely; single loosely; double 6. Lipids serve a number of functions in living organisms. Which of the following does NOT match a lipid with its function. Oils – waterproofing feathers and fur Steroid hormones – energy storage Carotenoids – light-absorbing pigments Cholesterol – maintaining membrane fluidity 7. Which of the following statements best explains the reason trans fats have negative health effects? Trans fats are made with vegetable oils. Trans fats have a long shelf life. Trans fats stay in the bloodstream longer than other lipids. Trans fats have been hydrogenated to remove all of their double bonds. 8. Like soap, which of the following molecules is also amphophilic – having both a hydrophilic and hydrophobic end? Steroids Water Waxes Phospholipids 9. A steroid hormone has undergone a mutation that makes it polar instead of nonpolar. How might this interfere with its function? The polar hormone won’t be able to pass through the cell membrane to reach its target. The polar hormone won’t be able to travel in the bloodstream to reach its target. The polar hormone will get stuck in the inside of the cell membrane. The polar hormone wouldn't be released by glands. 10. Which of the following is an exception to the general rule that unsaturated fats come from plants and saturated fats come from animals? Butter from a cow Oil pressed from seeds or olives Wax coatings on a leaf Lard in fatty meats like bacon Score Quiz
