practice_exam_I_sp07

practice_exam_I_sp07 - MCB 150 Practice Exam I, Spring 2007...

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MCB 150 Practice Exam I, Spring 2007 1 1. Which one of the following correctly pairs a macromolecule with one of its monomers? A. Nucleic Acid : Amino Acid B. Protein : Fatty Acid C. Protein : Amino Acid D. Lipid : Monosaccharide E. Lipid : Nucleotide 2. Which one of the following chemical formulas would most likely represent an oligosaccharide of four pentose sugars? A. C 20 H 40 O 20 B. C 24 H 48 O 24 C. C 24 H 42 O 21 D. C 20 H 34 O 17 E. C 20 H 32 O 16 3. The misfolded proteins that cause spongiform encephalopathies in a variety of species begin to deviate from their wild-type counterparts at what level of protein organization? A. Primary structure B. Secondary structure C. Tertiary structure D. Quaternary structure 4. Substance A is structurally very different from substance B but, if A is combined with the enzyme that normally hydrolyzes B, the enzyme is no longer able to hydrolyze B, even at very high concentrations of B. What is the most likely explanation for this observation? A. Substance A is an allosteric activator for this enzyme. B. The active site of the enzyme can bind substance A as well as substance B. C. Substance A is a competitive inhibitor with substance B. D. Substance A is a non-competitive inhibitor. E. All of the above are likely explanations for the inhibition seen in the presence of substance A.
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MCB 150 Practice Exam I, Spring 2007 2 5. Which one of the following molecules is not a direct component of a membrane phospholipid? A. Two fatty acid tails B. A triglyceride C. Glycerol D. A phosphate group E. All of the above molecules are direct components of membrane phospholipids. 6. What is the purpose of a fermentation reaction? Fermentation reactions: A. complete the oxidation of pyruvate . B. oxidize NADH back into NAD + . C. generate additional ATP in the absence of oxygen. D. reduce NAD + into NADH for anaerobic electron transfer. E. generate oxygen that in turn powers aerobic respiration. The following figure depicts three different cells, labeled A, B, and C. Use the figure to answer the next three (3) questions. 7. A close look at the physical structures of the three cells indicates that the genome of cell “A” is enclosed in a membrane-bound compartment, while the genomes of cells “B” and “C” are not enclosed in any separate compartment. Based on this information only, cell “A” would most accurately be called a(n) , cell “B” would most accurately be called a(n) , and cell “C” would most accurately be called a(n) . A. animal; plant; bacteria B. prokaryote; eukaryote; archae C. eukaryote; prokaryote; prokaryote D. eukaryote; bacteria; archae E. eukaryote; prokaryote; bacteria
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MCB 150 Practice Exam I, Spring 2007 3 8. A comparison of ribosomal RNA sequences (rRNA) from the three cells determines that the rRNA in cell “B” is closer in sequence to the rRNA in cell “A” than it is to the rRNA in cell “C”. Combining this data with the information given in the previous question, cell “B” would most accurately be called a(n)
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practice_exam_I_sp07 - MCB 150 Practice Exam I, Spring 2007...

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