BIO 2005 Test

BIO 2005 Test - Answer key to Exam 1 at 9 am in BISC 220...

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Answer key to Exam 1 at 9 am in BISC 220, Spring 2005 1 The following 29 multiple choice questions are worth 3 points each. Please CLEARLY write your answer in the left hand margin box. 1. Recent research suggests that side effects from Ritalin, the drug used to treat attention deficit disorder, may be caused by contamination of enantiomers, or molecules that a. have identical three-dimensional shapes. b. are mirror images of one another. c. lack an asymmetric carbon. d. differ in the location of their double bonds. e. differ in their electrical charge. Answer: b 2. All of the following statements are representative of the second law of thermodynamics except a. energy transfers are always accompanied by some loss. b. heat energy represents lost energy to most systems. c. systems tend to rearrange themselves toward greater entropy. d. highly organized systems require energy for their maintenance. e. every time energy changes form, there is a decrease in entropy. Answer: e 3. Zinc, an essential trace element, is presented in the active site of the enzyme carboxypeptidase. The zinc most likely functions as a(n) a. competitive inhibitor of the enzyme. b. noncompetitive inhibitor of the enzyme. c. allosteric activator of the enzyme. d. cofactor necessary for enzyme activity. e. coenzyme derived from a vitamin. Answer: d 4. A given solution is found to contain 0.0001 mol of hydrogen ions (H + ) per liter. Which of the following best describes this solution? a. acidic: H + acceptor b. basic: H + acceptor c. acidic: H + donor d. basic: H + donor e. neutral Answer: c 5. Which of the following pairs is mismatched? a. nucleolus-ribosomal RNA b. nucleus-DNA replication c. lysosome-protein synthesis d. cell membrane-lipid bilayer e. cytoskeleton-microtubules Answer: c 6. Which of the following are nitrogen bases of the pyrimidine type? a. guanine and glucose b. cystine and sucrose c. thymine and cytosine d. ribose and deoxyribose e. glycerol and glycogen Answer: c 7. The transfer of free energy from catabolic pathways to anabolic pathways is best called
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Answer key to Exam 1, 9 am, in BISC 220, Spring 2005 2 a. feedback regulation. b. bioenergetics. c. energy coupling. d. entropy. e. cooperativity. Answer: c 8. Hydrophobic substances like vegetable oil are a. non-ionic or nonpolar substances that repel water. b. non-ionic or nonpolar substances that have an affinity for water. c. ionic or polar substances that repel water. d. ionic or polar substances that have an affinity for water. e. ionic substances that readily dissolve in water. Answer: a 9.
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BIO 2005 Test - Answer key to Exam 1 at 9 am in BISC 220...

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