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114 Version Exam 1 sathasivan (48535) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page nd all choices before answering. should have 001 2.0 points Denaturation of double-stranded DNA by heat results in the separation of 2. 40 g of NaOH dissolved in 100 mL of solution. 1. 4 g of NaOH dissolved in 200 mL of solution. correct 3. 4 g of NaOH dissolved in 1 L of solution. 1. hydrogen bonds. correct 2. van der Waals forces. 3. hydrophobic interactions. 4. 4 g of NaOH dissolved in 100 mL of solution. 5. 40 g of NaOH dissolved in 1 L of solution. 4. ionic bonds. 5. covalent bonds. Explanation: Explanation: 4 g dissolved in 200 mL: 002 2.0 points What happens when a vegetable oil is hydrogenated? 1. The number of carbon atoms in the oil molecule decreases. 4g = 0. 5 M 200 mL 2. The number of carbon atoms in the oil molecule increases. 3. The number of carbon-carbon double bonds in the oil molecules decreases. correct is the same as 20 g dissolved in 1000 mL: 4. The ratio of carbon to hydrogen increases. 5. The oil becomes liquid at room temperature. Explanation: Hydrogenation adds hydrogens to the carbon skeleton and the number of C-C double bonds decreases and the oil becomes solid at room temperature. 003 2.0 points The molecular weight of NaOH is 40. To make a 0.5 M solution of NaOH, you 20 g = 0. 5 M 1000 mL 004 (part 1 of 2) 2.0 points The molecule Version 114 Exam 1 sathasivan (48535) N (CH3 )3 CH2 CH2 O P 2 5. cytoplasm Explanation: The above molecule is a phospholipid; they are major components of cell membranes. O O H2 C O O O C C 006 2.0 points The pH of black coee is about 5. The hydrogen ion concentration of beer is about one hundred times greater than that of coee. What is the pH of beer? CH2 CH O H2 C CH2 H2 C CH2 H2 C CH2 2. 6 H2 C CH 3. 2 H2 C 1. 7 CH H2 C 4. 3 correct CH2 H3 C 5. 5 CH2 CH3 is a 1. steroid. 2. protein. 3. triglyceride. 4. phospholipid. correct 5. monoglyceride. Explanation: Recall and application 005 (part 2 of 2) 2.0 points Which part of a cell will contain this molecule as its main component? 1. cytoskeleton 2. nucleus 3. cell wall 4. cell membrane correct Explanation: Each change of one unit on the pH scale indicates a tenfold change in the H+ concentration. A pH of 3 is one hundred times more acidic than a pH of 5. 007 2.0 points Which of the following correctly represents the biological hierarchy of organization, from lowest to highest? 1. atoms, elephant, trunk, muscles, amino acids, proteins 2. amino acids, proteins, muscle, trunk, elephant, atoms 3. elephant, trunk, muscles, amino acids, proteins, atoms 4. atoms, muscles, mitochondria, proteins, elephant, trunk 5. atoms, amino acids, proteins, mitochondria, muscle, trunk correct Explanation: The hierarchy is atoms, molecules, macro- Version 114 Exam 1 sathasivan (48535) molecules, organelle, tissue, organ. 008 2.0 points What happens when water vaporizes? 3 010 2.0 points Why are hydrocarbons not soluble in water? 1. Hydrocarbons are hydrophilic. 1. hydrogen bonds are broken correct 2. Hydrocarbons are polar. 2. hydrogen bonds are formed 3. Hydrocarbons always oat in water. 3. polar covalent bonds are broken 4. Hydrocarbons are large molecules. 4. bonds are not broken nor formed 5. Hydrocarbons are non-polar. correct 5. ionic bonds are formed Explanation: When water vaporizes, H-bonds between water molecules break to form water vapor. 009 2.0 points The functional group of the amino acid threOH. The functional group of the onine is amino acid valine is methyl. Where would you expect to nd these amino acids in globular protein in aqueous solution? 1. Valine would be in the interior, and threonine would be on the exterior of the globular protein. correct Explanation: Comprehension and factual recall 011 Which group is basic and becomes positively charged? 1. Explanation: OH is hydrophillic and would be normally found on the exterior and methyl group in valine makes it hydrophobic and found in the interior part of a protein. H OH 3. NH2 correct O C 5. 5. Threonine would be in the interior, and valine would be on the exterior of the globular protein. O 2. 2. Both would be on the exterior of the globular protein. 4. Both would be in the interior and on the exterior of the globular protein. O C 4. 3. Both would be in the interior of the globular protein. 2.0 points SH Explanation: Comprehension and application 012 2.0 points Two species in the same are more closely related than species in the same . 1. class; order 2. genus; order correct 3. order; genus 4. phylum Version kingdom; 114 Exam 1 sathasivan (48535) 4 5. phylum; class 1. from 4 to 6. Explanation: Comprehension 2. from 3 to 10. 013 2.0 points The structures shown in the gure 4. from 2 to 4. correct OH H3 C CH2 H 3. from 6 to 8. N C C H H O OH H H2 O CH3 CH N C C H H 5. from 0 to 6. OH O Explanation: The pH change is drastic below 2 and above 4, so the range of pH maintained by this is 24. are (amino acids, sugars) and this reaction results in the formation of what kind of bonds? 015 2.0 points Which of the molecules 1. sugars; ionic bonds 2. amino acids; peptide bonds correct N (CH3 )3 CH2 A) CH2 O 3. sugars; peptide bonds P O O 4. amino acids; hydrogen bonds 5. amino acids; glycosidic bonds Explanation: Factual recall and comprehension. 014 2.0 points The gure below was generated by measuring the pH change in a solution buered with acetic acid, after adding either 1 M HCl (acid) or 1 M NaOH (base). H2 C O OH C H C O C H H O C O O B) CH2 CH C H H2 C CH2 H C H H2 C CH2 H C H H2 C CH2 H C H H2 C CH H C H H C H CH H2 C CH2 H2 C H CH2 H3 C CH3 10 9 8 7 6 pH 5 4 3 2 1 0 O C) O OO O O O D) CH2 OH OH H H Add Acid H OH Add Base This acetic acid buer will be eective in maintaining pH in the range of approximately CH2 OH H HO H OH O OH H OH H OH H OH Version 114 Exam 1 sathasivan (48535) E) F) O HOCH2 OH H H OH H OH H OH OH H G) O H C C HO OH H OH HO H HO H) C 4. C and D CH2 OH H H OH H O C H C OH H HO C H C H H C OH H C OH H C OH H C OH H C OH H I) H3 J) H3 C O C C C H C K) CH2 3. You need to know the molarity of SDS to calculate this. CH3 Explanation: O OH C1 V1 = C2 V2 0.10 V1 = 0.02 (100 mL) V1 = 20 mL of 10% SDS H H C H C M) OH OH C H O H2 N OH H N HC C N The amount of water is then 100 mL 20 mL = 80 mL. C OH SH O) C C C CH2 NH2 N N CH H H O N C H OH H could be linked together to form a monomer of RNA? 2. I, M, and O 3. G and H 017 2.0 points What is major purpose of dierent RNA molecules? C H 1. A, B, and L 4. mix 2 mL of SDS and 98 mL of water 5. mix 20 mL of SDS and 80 mL of water correct H P CH3 N) 016 2.0 points How will you prepare a 100 mL solution of 2% SDS from the stock solution of 10% SDS ? 2. mix 50 mL of SDS and 50 mL of water O S H Explanation: Comprehension 1. mix 25 mL of SDS and 75 mL of water O CH2 L) 5. E, K, and N correct H H N+ 5 1. to transmit genetic information to the next generation 2. to store genetic information 3. to synthesize amino acids 4. to act as a template to form DNA 5. to function in the synthesis of proteins correct Explanation: Comprehension and recall Version 114 Exam 1 sathasivan (48535) 6 this larger polymer. 018 2.0 points Humans can digest starch but not cellulose bers because humans have enzymes that can digest only 020 If 128 of CH2 OH 1. nonpolar covalent bonds but not polar covalent bonds. 4. -1,4 glycosidic linkages but not -1,4 glycosidic linkages. OH H H OH H HO 2. ionic bonds but not covalent bonds. 3. -1,4 glycosidic linkages but not -1,4 glycosidic linkages. correct 2.0 points OH H OH were covalently joined together, what would be the resulting molecule(s)? 1. a polypeptide 2. 127 water molecules 5. peptide bonds but not glycosidic bonds. Explanation: 3. a polypeptide and 127 water molecules 4. a polysaccharide 019 2.0 points You have eaten a potato chip that contained starch made of 10,000 glucose monomers combined together. After complete digestion through hydrolysis, this will yield I) 10,000 glucose molecules. II) 10,000 water molecules. III) 9,999 water molecules. IV) 9,999 glucose molecules. 1. III and IV only 5. a polysaccharide and a polypeptide 6. a polysaccharide and 127 water molecules correct Explanation: 021 2.0 points The molecule HHHHHHH O H 4. I and II only 5. I only correct Explanation: Hydrolysis is the breakdown of a larger molecule to simpler molecule. It uses water and does not form any water molecules. Hence a complete digestion of a polymer with 10,000 monomers will yield only 10,000 monomers. To go into further details, it will utilize 9999 water molecules to break down C H C C H C C C C OH 2. I and III only 3. II only C H is a 1. monounsaturated fatty acid. 2. polysaccharide. 3. protein. 4. polyunsaturated fatty acid. correct 5. saturated fatty acid. Explanation: The two double bonds on the hydrocarbon and the carboxyl group indicate that this is Version 114 Exam 1 sathasivan (48535) polyunsaturated fatty acid. 7 ... View Full Document

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