To access the Molecular Biology 2 website:  http://users.bergen.org/dondew/bio/molbio/molbio2.html

Questions For Your Consideration Lipids PPAO* 2 Multiple Choice Questions Preparations Bergen County Academies Biology 110641, 2008 with Dr. Don DeWitt (v1 as of 3/9/08) Return to Mol Bio II Lipids PPAO Descriptions (i.e.,where you just came from) You are responsible for Lipids Structure & Function in chapters 1-2 in the Molecular Biology book, Dr. DeWitt’s carbohydrate chemistry and function computer programs and class notes/discussions.  Check DUE DATES to determine the date of the PPAO.  There will be no retakes.  Your grade on this exam is final.  This exam will count 24% of your trimester 2 grade.  If you do not show up for this exam, your makeup exam will include 20 multiple choice questions (with the second 10 about which you have no idea about their topic.) Exam Format: The format of the PPAO will be a combination of:  TWO essays. Essay questions details may be accesed at ESSAYS.  (70 points) TEN multiple choice questions that include the material covered by the topics shown in the Practice Questions below. (30 points) ONE extra credit question on any topic (6 points) The multiple choice question on the exam will be similar to those provided below except that the answers will be changed or some answers may have their truth reversed.  For instance, on the Practice Questions you might find a statement such as: A triglyceride is constructed from one glycerol and four fatty acids.  On the exam, it might be changed to A triglyceride is constructed from one glycerol and three fatty acids all of which must be unsaturated. In any case, the TOPIC of each question is critical.  Examine each question and determine its topic.  You then know that only these topics will be found on the multiple choice section of the exam  You then can focus on knowing everything about those 10 topics. Of course, remember that other topics will be tested via the essay section of the exam.  Multiple Choice Practice Questions Instructions: Please circle the letter of the best answer.  Each question is valued at 3 points on the PPAO.  There will be partial credit awarded.   1. The molecule sphingomyelin a. contains glycerol. b. is a phospholipid. c. is a neutral lipid. d. is found in  cell membranes. e. All of the above are true. f. a, c & d g. a & d 2. Phospholipids . a. are made of polymers of fats. b. contain the sugar ribose. c. are important components of cell membranes. d. contain fatty acids. e. All of the above are true. f. c & d g.  a, c & d 3. Waxes a. are important components of cell membranes. b. are the major components of arthropod exoskeletons. c. contain three fatty acids and one glycerol molecule. d.  are used as major energy storage molecules. e. None of the above are true. f. a, b & d g.  c & d 4. Unsaturated fatty acids a. have a full complement of hydrogen atoms per carbon atom. b. have a carboxyl group at one end. c. have more carbons than saturated fatty acids. d. have a higher melting point than their same carbon-length saturated fatty acid cousins. e. None of the above are true. f. a, b & c g. c & d 5. The synthesis of a neutral fat a. involves a loss of a water molecule. b. involves the gain of a water molecule. c. requires an enzyme. d. requires three equal fatty acids. e. All of the above are true. f. a, b & d g. a & b 6. Double bonds a. are found in all lipids. b. are found more in unsaturated fats than in saturated fats. c. are found between carbons or between a carbon and an oxygen atom in lipids. d. are important in determining the structure of eicosanoids such as prostaglandins. e. All of the above are true. f. b, c & d g. a & c 7. A fatty acid . a. may have as many carbon atoms as 16. b. is part of the tail structure of phospholipids and glycolipids found in cell membranes. c. has a methyl group at one end. d. can be broken down into a series of glucose molecules. e. All of the above are true. f. a, b & c g. a & c 8. Glycerol a. is a phospholipid. b. is the backbone of neutral fats. c. is the backbone of sphingomyelin. d. has four carbons. e. All of the above are true. f. a, b & d g. b & c 9. Something that is lipid soluble a. can move through a cell membrane. b. can not also be water soluble. c. will not be soluble in the cytoplasm. d. might feel greasy. e. None of the above are true. f. b & d g. a, c & d 10. Soaps a. are part of a class of molecules called detergents. b. can be the product produced when a fatty acid reacts with sodium hydroxide (NaOH) or potassium hydroxide (KOH). c. that decrease the surface tension of air water interfaces are called surface active agents or surfactants. d. can form bubbles in air with the same membrane organization as living cells. e. All of the above are true. f. c & d g. a, b & c