Hw/All Exams - Version 056 Exam 1 Sathasivan(48475 This...

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Version 056 – Exam 1 – Sathasivan – (48475) 1 This print-out should have 50 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points You have eaten a potato chip that contained starch made oF 10,000 glucose monomers com- bined together. AFter complete digestion through hydroly- sis, this will yield I) 10,000 glucose molecules. II) 10,000 water molecules. III) 9,999 water molecules. IV) 9,999 glucose molecules. 1. I and II only 2. I only correct 3. II only 4. I and III only 5. III and IV only Explanation: Hydrolysis is the breakdown oF a larger molecule to simpler molecule. It uses wa- ter 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 this larger polymer. 002 10.0 points Which two Functional groups are always Found in amino acids? 1. alcohol and aldehyde 2. carboxyl and amine correct 3. carbonyl and carboxyl 4. amine and sulFhydryl 5. ketone and amine Explanation: ±actual recall 003 10.0 points A chemist wishes to make an organic molecule non-acidic. Which Functional group should be removed in the molecule, iF it is present? 1. amino 2. sulFhydryl 3. hydroxyl 4. carbonyl 5. carboxyl correct Explanation: Comprehension and application 004 10.0 points What is the solute molecule that is most likely soluble in water? 1. charged only 2. polar, either charged or uncharged cor- rect 3. polar uncharged only 4. nonpolar 5. hydrophobic Explanation: Comprehension 005 10.0 points The pH oF black co²ee is about 5. The hy- drogen ion concentration oF beer is about one hundred times greater than that oF co²ee. What is the pH oF beer? 1. 5 2. 6
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Version 056 – Exam 1 – Sathasivan – (48475) 2 3. 7 4. 3 correct 5. 2 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. 006 10.0 points Consider the structure HO H 3 C H 3 C H 3 C CH 3 What is it? 1. a protein 2. a cellulose molecule 3. a nucleotide 4. a steroid correct 5. a starch molecule Explanation: Steroids have four fused carbon rings and various functional groups attached to them. 007 10.0 points What happens when a vegetable oil is hydro- genated? 1. The number of carbon-carbon double bonds in the oil molecules decreases. cor- rect 2. The number of carbon atoms in the oil molecule decreases. 3. The number of carbon atoms in the oil molecule increases. 4. The oil becomes liquid at room tempera- ture. 5. The ratio of carbon to hydrogen in- creases. 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.
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Hw/All Exams - Version 056 Exam 1 Sathasivan(48475 This...

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