2 The double bonds in naturally occurring fatty acids are usually isomers Exam 3 Chapters 11 16 CHAPTER 11 Lipids Membranes 1 Fatty acid groups are referred to as groups A Acetyl B Acyl C Prenyl D Isoprenoid E Isopentenyl A Cis B Trans C Both cis and trans D Essential E Non essential 3 The essential fatty acids are A Arachidonic acid B Linoleic acid C Linolenic acid D Both A and B are correct E Both B and C are correct A Amides B Ethers C Anhydrides D Epoxides E Esters 5 Prostaglandins are involved in A Ovulation B Inflammation C Digestion D Both A and B are correct E All of the above are correct 6 The functions of fat include A Insulation B Energy storage C Water repellent properties D Both A and B are correct E All of the above are correct 4 Fatty acids react with alcohols to form 7 Waxes A Are complex mixtures of nonpolar lipids B Are esters formed from long chain fatty acids and long chain alcohols C Contain hydrocarbons sterols and alcohols D Both A and B are correct E Both A and C are correct 8 Phospholipids are A Structural components of membranes B Surface active agents C Rich energy sources D Both A and B are correct E All of the above are correct 9 Phosphatidylcholine is sometimes referred to as A PIP2 B Cephalin C Ceramide D Cardiolipin E None of the above is correct 10 The myelin sheath is A Surrounds nerve cell axons B Contains large amounts of cardiolipin C Facilitates nerve impulse transmission D Both A and B are correct E Both A and C are correct 11 All of the following are glycolipids except A Sulfatides B Cerebrosides C Gangliosides D Both A and B are correct E None of the above are correct 12 The role of very low density lipoproteins is A Scavenging the cholesterol from cell membranes B Transporting of lipids from liver to tissue C Transporting of cholesterol esters to the liver D Both A and B are correct E All of the above are correct 13 Which of the following statements concerning carotenoids is not true A Carotenoids are the only examples of the monoterpenes B The carotenes are hydrocarbon members of the carotenoids C Xanthophylls are oxygenated derivatives of the carotenes D Carotenoids are orange colored pigments E None of the above is true 14 Which of the following statements concerning coronary artery disease is not true A Coronary artery disease is one of the most common consequences of atherosclerosis B High plasma LDL levels are correlated with high risk for coronary artery disease C Cells destined to become foam cells in the lining of blood vessels possess LDL D The macrophages found within atherosclerotic plaque possess LDL receptors with an receptors affinity for oxidized LDL E None of the above is true 15 The basic structure of biological membranes is a consequence of the physical properties of A Proteins B Phospholipids C Cholesterol D Water E None of the above is correct 16 A membrane s fluidity is largely determined by its percentage of A Pholphatidyl choline B Phosphatidylethanolamine C Fatty acids D Cardiolipin E Unsaturated fatty acids 17 In the fluid mosaic model of membrane structure A Proteins form an inner layer between two layers of lipid B Proteins coat an inner layer of lipids C Proteins float in a lipid bilayer D Proteins are covalently bonded to the lipid bilayer E All of the above are true 18 Which of the following statements concerning anion channel proteins is not true A It plays an important role in CO2 transport in blood B It facilitates the chloride shift C HCO3 and Cl exchange occurs through the anion channel protein D The N terminal methionine residue of the anion channel protein is prenylated E All of the above 19 Energy requiring transport mechanisms include A Primary active transport B Diffusion C Facilitated diffusion D Both A and B E Both A and C 20 In simple diffusion a solute A Is propelled by random molecular motion B Moves up its concentration gradient C Moves across a membrane because of an input of free energy D Both A and B E All of the above 21 Which of the following statements is not true A Membrane potential is an electrical gradient across a membrane B A decrease in membrane potential is referred to as membrane depolarization C The term repolarization is defined as the reestablishment of the original membrane potential negative D The diffusion of K ions out of a nerve cell makes the inside of the membrane less E The Na channel in muscle and nerve cells is a voltage gated channel 22 In muscle cells local depolarization caused by acetylcholine binding leads to the opening of the voltage gated channels A Cl B K C H D Na E Glucose permease 23 The function of glucose permease is an example of A Primary active transport B Secondary active transport C Facilitated diffusion D Simple diffusion E None of the above 24 The glucose permease is an example of a an A Uniporter B Symporter C Antiporter D Membrane receptor E None of the above 25 Membrane receptors are transmembrane molecules or molecular complexes that A Monitor and respond to changes in the cell s environment B Bind to hormones or neurotransmitters C Are involved in embryonic and fetal development D Initiate intracellular response when they bind an appropriate molecules E All of the above 26 Patients with familial hypercholesterolemia A Possess depressed levels of plasma cholesterol B Must inherit defective genes from both parents in order to display symptoms of the disease C Develop xanthomas D Both A and B E Both A and C A Possess depressed levels of plasma cholesterol B Have missing or defective LDL receptors C Are homozygous or heterozygous for a nonfunctioning LDL receptor gene D Have very high levels of serum cholesterol E B C and D are correct 27 is a technique used to investigate lateral diffusion of membrane components A NMR B X ray crystallography C Fluorescence recovery after photobleaching D Spectroscopy E ESR 28 Bacterorhodopsin of the purple membrane of Halobacterium A Acts as a light driven Cl channel B Is the sole protein component of purple membrane C Is formed under conditions of low O2 concentration and high light intensity D Both A and B E Both B and C 29 RBC membrane is useful in membrane research because it is A Obtainable in large amounts from blood banks B Easily purified C Easily separated from intracellular membrane D Both A and B E All of the above 30 Nephrogenic diabetes insipidis is A A rare genetic disease B Caused by a mutated water channel C A malady in which affected individuals produce excessively concentrated urine D Both