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Solved Questions on Organic and Biological Chemistry – Exam | CHEM 1152K, Exams of Chemistry

University of West Georgia (UWG)Chemistry
Prof. Anne Gaquere

Material Type: Exam; Professor: Gaquere-Parker; Class: Survey of Chemistry II; Subject: Chemistry; University: University of West Georgia; Term: Spring 2014;

Typology: Exams

2013/2014

Uploaded on 03/10/2014

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General, Organic, and Biological Chemistry, 4e (Timberlake)
Chapter 17 Lipids
17.1 Multiple-Choice Questions
1) Which statement is NOT true?
A) Lipids are found in cell membranes.
B) Lipids are soluble in organic solvents.
C) There are many different types of lipids.
D) All lipids contain fatty acids.
E) Some hormones are lipids.
Answer: D
Objective: 17.1
Global Outcomes: GO7
For the question(s) that follow, identify the class of lipid to which each of the following
molecules belongs.
2)
A) wax
B) triacylglycerol
C) glycerolphospholipid
D) glycosphingolipid
E) steroid
Answer: A
Objective: 17.1
Global Outcomes: GO2
1
Copyright © 2013 Pearson Education, Inc.
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General, Organic, and Biological Chemistry, 4e (Timberlake) Chapter 17 Lipids 17.1 Multiple-Choice Questions

  1. Which statement is NOT true? A) Lipids are found in cell membranes. B) Lipids are soluble in organic solvents. C) There are many different types of lipids. D) All lipids contain fatty acids. E) Some hormones are lipids. Answer: D Objective: 17. Global Outcomes: GO For the question(s) that follow, identify the class of lipid to which each of the following molecules belongs.

A) wax B) triacylglycerol C) glycerolphospholipid D) glycosphingolipid E) steroid Answer: A Objective: 17. Global Outcomes: GO 1

A) triacylglycerol B) wax C) glycerolphospholipid D) bile salt E) steroid Answer: A Objective: 17. Global Outcomes: GO

A) glycerophospholipid B) triacylglycerol C) glycosphingolipid D) steroid E) wax Answer: A Objective: 17. Global Outcomes: GO 2

A) bile salt B) triacylglycerol C) prostaglandin D) wax E) sphingolipid Answer: A Objective: 17. Global Outcomes: GO

  1. Lipids are compounds that are soluble in A) distilled water. B) normal saline solution. C) glucose solution. D) chloroform. E) oxygen. Answer: D Objective: 17. Global Outcomes: GO
  2. Which of the following is NOT a function of lipids in the human body? A) energy storage B) insulation C) protection D) emulsification E) pH regulation Answer: E Objective: 17. Global Outcomes: GO 4
  1. Which of the following lipids will give no fatty acid when hydrolyzed? A) wax B) fat C) phospholipid D) glycolipid E) cholesterol Answer: E Objective: 17. Global Outcomes: GO
  2. A polyunsaturated fatty acid contains more than one A) carboxyl group. B) hydroxyl group. C) carbonyl group. D) long carbon chain. E) double bond. Answer: E Objective: 17. Global Outcomes: GO
  3. Unsaturated fatty acids have lower melting points than saturated fatty acids because A) they have fewer hydrogen atoms. B) they have more hydrogen atoms. C) their molecules fit closely together. D) the cis double bonds give them an irregular shape. E) the trans double bonds give them an irregular shape. Answer: D Objective: 17. Global Outcomes: GO
  4. Which of the following is an unsaturated fatty acid? A) myristic B) oleic C) palmitic D) stearic E) lauric Answer: B Objective: 17. Global Outcomes: GO 5
  1. Choose the saturated fatty acid from the compounds below. A) B) C) D) E) Answer: E Objective: 17. Global Outcomes: GO
  2. Which of the following is a fatty acid which is a solid at room temperature? A) B) C) D) E) Answer: E Objective: 17. Global Outcomes: GO 7
  1. Which of the following fatty acids is most likely to be a liquid at room temperature? A) B) C) D) E) Answer: A Objective: 17. Global Outcomes: GO
  2. A double cheeseburger with bacon contains 640 kcal and 39 g of fat. Calculate the number of kilocalories from fat. (1 gram of fat = 9 kcal; 1 gram of carbohydrate or protein delivers 4 kcal.) A) 4.3 kcal from fat B) 39 kcal from fat C) 71 kcal from fat D) 350 kcal from fat E) 640 kcal from fat Answer: D Objective: 17.2, 17. Global Outcomes: GO
  3. A double cheeseburger with bacon contains 640 kcal and 39 g of fat. Calculate the percentage of total kilocalories due to fat (1 gram of fat = 9 kcal). A) 0.68% of total kilocalories B) 6.1% of total kilocalories C) 11% of total kilocalories D) 55% of total kilocalories E) 100% of total kilocalories Answer: D Objective: 17.2, 17. Global Outcomes: GO 8
  1. Choose the saturated triacylglycerol from the compounds below. A) B) C) D) E) Answer: D Objective: 17. Global Outcomes: GO
  2. Waxes are lipids derived from A) a long-chain alcohol and a long-chain fatty acid. B) glycerol and three fatty acids. C) glycerol, fatty acids, phosphate, and an amino alcohol. D) sphingosine, fatty acids, phosphate, and an amino alcohol. E) terpenes and steroids. Answer: A Objective: 17. Global Outcomes: GO 10
  1. A triacylglycerol that is solid at room temperature is called a(n) A) cephalin. B) lecithin. C) oil. D) wax. E) fat. Answer: E Objective: 17. Global Outcomes: GO
  2. Commercially, liquid vegetable oils are converted to solid fats such as margarine by A) hydrogenation. B) hydrolysis. C) hydration. D) oxidation. E) saponification. Answer: A Objective: 17. Global Outcomes: GO
  3. Margarine containing partially hydrogenated soybean oil is solid because A) it contains only saturated fats. B) it contains only trans fatty acids. C) some of its double bonds have been converted to single bonds. D) it contains only cis double bonds. E) it contains only polyunsaturated fatty acids. Answer: C Objective: 17. Global Outcomes: GO 11
  1. The products of the acid catalyzed hydrolysis of a fat are A) the esters of fatty acids. B) fatty acids and glycerol. C) salts of fatty acids. D) salts of fatty acids and glycerol. E) phospholipids. Answer: B Objective: 17. Global Outcomes: GO
  2. The products of the saponification of a fat are A) the esters of fatty acids. B) fatty acids and glycerol. C) salts of fatty acids. D) salts of fatty acids and glycerol. E) phospholipids. Answer: D Objective: 17. Global Outcomes: GO
  3. Glycerophospholipids can interact both with other lipids and water because they contain both __________ and __________. A) single bonds; double bonds B) polar regions; nonpolar regions C) glycerol; sphingosine D) saturated fatty acids; unsaturated fatty acids E) bile salts; cholesterol Answer: B Objective: 17. Global Outcomes: GO 13
  1. The components in the following glycerophospholipid are A) sphingosine, palmitic acid, phosphate, and choline. B) sphingosine, palmitic acid, phosphate, and serine. C) glycerol, palmitic acid, phosphate, and ethanolamine. D) glycerol, palmitic acid, phosphate, and galactose. E) sphingosine, palmitic acid, phosphate, and ethanolamine. Answer: C Objective: 17. Global Outcomes: GO
  2. In the list below, which lipid type is most soluble in water? A) triacylglycerols B) glycerophospholipids C) oils D) steroids E) waxes Answer: B Objective: 17. Global Outcomes: GO
  3. What phospholipid contains fatty acids but NOT glycerol? A) lecithin B) glycolipid C) sphingolipid D) cephalin E) corticosteroid Answer: C Objective: 17. Global Outcomes: GO 14
  1. Synthesis of cholesterol and bile salts takes place in the A) liver. B) gall bladder. C) small intestine. D) large intestine. E) pancreas. Answer: A Objective: 17. Global Outcomes: GO
  2. Which of the following is NOT a lipoprotein that carries nonpolar lipids through the bloodstream? A) sphingosine B) LDL C) HDL D) VLDL E) chylomicron Answer: A Objective: 17. Global Outcomes: GO
  3. The steroid hormone that increases the blood glucose and glycogen levels from fatty acids and amino acids is A) aldosterone. B) progesterone. C) cortisone. D) estrogen. E) prednisone. Answer: C Objective: 17. Global Outcomes: GO
  4. The steroid hormone present in birth control pills is A) aldosterone. B) progesterone. C) cortisone. D) estrogen. E) norethindrone. Answer: E Objective: 17. Global Outcomes: GO 16
  1. Which of the following is a lipid? A) cholesterol B) nicotine C) aniline D) lactose E) collagen Answer: A Objective: 17. Global Outcomes: GO
  2. The main lipid components in cellular membranes are A) glycerolphospholipids. B) terpenes. C) steroids. D) triacylglycerols. E) waxes. Answer: A Objective: 17. Global Outcomes: GO
  3. In the fluid-mosaic model that describes plasma membranes, A) there are three layers of glycerophospholipid molecules. B) two layers of glycerophospholipid molecules have their nonpolar sections oriented to the inside of the membrane. C) two layers of glycerophospholipid molecules have their nonpolar sections along the outer surface of the membrane. D) A single row of glycerophospholipid molecules forms a barrier between the inside and outside of the cell. E) two layers of proteins separate the contents inside a cell from the surrounding fluids. Answer: B Objective: 17. Global Outcomes: GO
  4. Channel proteins in cell membranes serve what function? A) They add strength and rigidity to the membrane. B) They provide pathways for water and electrolytes to move through cell membranes. C) They form the bilayer portion of the membrane. D) They allow nonpolar substances to move through the membrane. E) They prevent interactions between the nonpolar tails of the phospholipids which gives the membrane its fluidity. Answer: B Objective: 17. Global Outcomes: GO 17

Answer the question(s) that follow about the diagram shown below.

  1. In this diagram of a cell membrane, the small branched object labeled (A) is part of a A) steroid. B) hydrophobic region. C) membrane protein. D) glycerophospholipid. E) carbohydrate side chain. Answer: E Objective: 17. Global Outcomes: GO
  2. In this diagram of a cell membrane, the objects labeled (E) are A) steroids. B) hydrophobic regions. C) proteins. D) phospholipids. E) carbohydrate side chains. Answer: C Objective: 17. Global Outcomes: GO
  3. In this diagram of a cell membrane, the object labeled (C) is a A) steroid. B) hydrophobic region. C) phospholipid. D) mitochondrion. E) glycolipid. Answer: B Objective: 17. Global Outcomes: GO 19
  1. In this diagram of a cell membrane, the object labeled (B) is a A) steroid. B) hydrophobic region. C) membrane protein. D) glycerophospholipid bilayer. E) carbohydrate side chain. Answer: D Objective: 17. Global Outcomes: GO
  2. In this diagram of a cell membrane, the object labeled (D) is part of a A) steroid. B) hydrophobic region. C) cholesterol. D) glycerophospholipid. E) glycosphingolipid. Answer: C Objective: 17. Global Outcomes: GO
  3. Which of the following is NOT a lipid? A) oleic acid B) cholesterol C) carnuba wax D) DNA E) lecithin Answer: D Objective: 17. Global Outcomes: GO
  4. Which of the following is a polyunsaturated fat? A) triolein B) tripalmitin C) tristearin D) trimyristin E) trilinolein Answer: E Objective: 17. Global Outcomes: GO 20