Question

16. Which of the following types of compounds are expected products from the saponification of an oil? a. glycerol and fatty acids b. glycerol and fatty acid salts c. fatty acid salts and fatty acids d. fatty acids and glycine 17. Prostaglandins and thromboxanes are classes of eicosanoids. a. TRUE b. FALSE In general, lipids are substances that are only sparingly soluble in water a. TRUE b. FALSE 18. 19. In activ e transport, a substance crosses a cell membrane against a concentration gradient. a. TRUE b. FALSE 20. Which of the following statements concerning fatty acids is incorrect? a. Some fatty acids needed in the human body must be obtained from food because they cannot be synthesized with the body b. Fatty acids are rarely found in the free state in nature. c. At least 16 carbon atoms must be present in the carbon chain of a fatty acid d. Double bonds present in fatty acids are almost always in a cis-configuration. 21. Partial hydrogenation of a fat or oil a. produces fatty acid salts b. increases the degree of fatty acid unsaturation c. increases the melting point 22. In which of the following "head-and-two-tail" type lipids are both "tails" fatty acids? a. Glycerophospholipid b. Sphingophospholipid c. sphingoglycolipid 23. In which of the following types of lipids are both ester and amide linkages present? a. Sphingophospholipids b. Glycerophospholipids c. sphingoglycolipids 24. Which of the following statements concerning lipid bilayers is correct? a. Both the exterior and interior surface of a lipid bilayer contain groups that are nonpolar. b. The interior of a lipid bilayer is polar c. The two layers of molecules in a lipid bilayer are present in a "tail-to-tail" arrangement. 25. Cholesterol is both a steroid and a membrane lipid. a. TRUE b. FALSE

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Answer 1

Option (b) is correct E_g - CH_2 OCOR_ Vertical-bar CHOCOR + 3NaOH rightarrow CH_2OH_ Vertical-bar CH_2OH + 3R COONa CH_2OCOr sodium hydroxide CH_2OH clycerol Fatty acids salt Triglyceride option (a) is correct option (a) is correct As liquids are non polar they are only sparingly soluble or even insoluble in water option (a) is correct In active transport, a substance crosses a cell membrance against a concentration gradient and therefore requires input of energy from the cell option (c) & (d) re correct carbon chain off a fatty acid can have less than 16 carbons and also more than 16 carbons Double bonds present in fatty acids can be in is - configuration or trans configuration option (c) is correct partial hydrogeneration of oil or fat produces oils of higher melting point option (a) is correct \r\n option (a) is correct sphingophospholipids have both ester and amide linkages option (c) is correct option (a) is correct cholestrol is a steroid and steroids are