Exam 1-solutions - Version 114 Exam 1 sathasivan(48535 1...

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Version 114 – Exam 1 – sathasivan – (48535) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 2.0points Denaturation of double-stranded DNA by heat results in the separation of 1. hydrogen bonds. correct 2. van der Waals forces. 3. hydrophobic interactions. 4. ionic bonds. 5. covalent bonds. Explanation: 002 2.0points What happens when a vegetable oil is hydro- genated? 1. The number of carbon atoms in the oil molecule decreases. 2. The number of carbon atoms in the oil molecule increases. 3. The number of carbon-carbon double bonds in the oil molecules decreases. cor- rect 4. The ratio of carbon to hydrogen in- creases. 5. The oil becomes liquid at room tempera- ture. Explanation: Hydrogenation adds hydrogens to the car- bon skeleton and the number of C-C double bonds decreases and the oil becomes solid at room temperature. 003 2.0points The molecular weight of NaOH is 40. To make a 0.5 M solution of NaOH, you should have 1. 4 g of NaOH dissolved in 200 mL of solution. correct 2. 40 g of NaOH dissolved in 100 mL of solution. 3. 4 g of NaOH dissolved in 1 L of solution. 4. 4 g of NaOH dissolved in 100 mL of solution. 5. 40 g of NaOH dissolved in 1 L of solu- tion. Explanation: 4 g dissolved in 200 mL: 4 g 200 mL = 0 . 5 M is the same as 20 g dissolved in 1000 mL: 20 g 1000 mL = 0 . 5 M 004(part1of2)2.0points The molecule
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Version 114 – Exam 1 – sathasivan – (48535) 2 H 2 C O C O H 2 C H 2 C H 2 C H 2 C H 2 C H 2 C H 3 C CH O C O CH 2 CH 2 CH 2 CH CH CH 2 CH 2 CH 3 CH 2 O P O O CH 2 CH 2 N - (CH 3 ) 3 is a 1. steroid. 2. protein. 3. triglyceride. 4. phospholipid. correct 5. monoglyceride. Explanation: Recall and application 005(part2of2)2.0points Which part of a cell will contain this molecule as its main component? 1. cytoskeleton 2. nucleus 3. cell wall 4. cell membrane correct 5. cytoplasm Explanation: The above molecule is a phospholipid; they are major components of cell membranes. 006 2.0points The pH of black coffee is about 5. The hy- drogen ion concentration of beer is about one hundred times greater than that of coffee.
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