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MSU BMB 200 - BMB200_FS15_finalexam_allforms

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BMB200_FS15_final_FormABMB200_FS15_final_FormB_printBMB200_FS15_final_FormC_printBMB200_FS15_final_FormD_printBMB200 FS15 Final exam (100 pts) FORM A There are 50 questions on this exam. Each question is worth 2 pts. Choose the answer that best answers the question or completes the statement. 1. Which of the following statements is correct?A The pH is a measure of the acid strength B The pH is determined by the hydrogen ion concentration in solution C The pH is a measure of the hydrophobicity index D The pH is the point at which an amino acid is electrically neutral 2. Which of the following is the most basic solution?A 0.001 M NaOHB 0.1 M HClC 0.1 M NaClD 0.001 M HClE 0.1 M NaOH3. Which of the following statements is CORRECT?A Amino acids can function as building blocks for DNAB Amino acids can be converted to hormonesC Essential amino acids can be synthesized in our bodyD Amino acids are monoprotic, diprotic or triprotic4. What does the expression “amino acids are zwitterions” mean?A When two amino acids are combined, one becomes positively charged and the secondamino acid becomes negatively chargedB Amino acids are diprotic acidsC Because amino acids are charged, they are linked by ionic bonds to form thepolypeptide backboneD At neutral, physiological pH the amino terminus and the carboxy-terminus are positivelyand negatively charged, respectively, but the entire molecule is neutral.5. Which of the following statements is CORRECT?A The polypeptide backbone of a protein has a limited flexibility because of the rigidity dueto the partial double bond character of the peptide bondsB The twenty amino acids used for protein synthesis in our body are also calledessential amino acidsC Because amino acids are charged, they are linked by ionic bonds to form thepolypeptide backboneD Amino acids carry genetic information6. ProteinsA Are formed by amino acids connected through peptide bondsB Are defined by their primary, secondary, tertiary, and quaternary structureC Are considered zwitterions because they have a positively charged aminoterminus and a negatively charge carboxy terminusD Consist only of single moleculesBMB200 FS15 Final exam (100 pts) FORM A The above amino acids form the following sequence: Leu-Trp-Leu-Pro-Trp-Leu-Pro-Leu-Gly-Leu-Leu-Lys 7. What is the amino -terminal amino acid? A Tryptophane (Trp) B Leucine (Leu) C Lysine (Lys) D Proline (Pro) E Glycine (Gly) 8. It is a A aromatic amino acid B hydrophobic amino acid C basic amino acid D acidic amino acid 9. Which of the above amino acids would be at the periphery (outside) of a soluble protein? A Trp B Leu C Lys D Pro 10. How do enzymes function? A Enzymes change the Km of the reaction. B Enzymes increase the initial free energy of the substrate. C Enzymes make the overall reaction more favorable thermodynamically (lower ΔG) D Enzymes catalyze the reaction by changing the equilibrium. E Enzymes favor the formation of the transition state. Trp Leu Gly Lys Pro ( )4 NH3+BMB200 FS15 Final exam (100 pts) FORM A 11. Activation energy is A energy that must be added to get a reaction started B difference in energy between reactants and products C energy that is lost as heat D free energy E equal to the entropy times the absolute temperature 12. Which of the following statements is CORRECT? A Hemoglobin is an allosteric protein B Hemoglobin has a higher affinity for oxygen than myoglobin C Hemoglobin moves oxygen to the brain, while myoglobin moves it to the lungs D Hemoglobin binds two Oxygen molecules per subunit 13. Vitamin C A Is a water-insoluble vitamin B It is an antioxidant C Excess Vitamin C is stored in the liver and leads to hypervitaminosis D Too much vitamin C causes scurvy E It plays a role in connective tissue formation 14. Scurvy A is due to the lack of a cofactor in the enzyme that converts phenylalanine to tyrosine B is due to the lack of a cofactor in the enzyme that converts proline to hydroxyproline C is treated by eating a diet rich in hydroxyproline D is a result of Vitamin A deficiency E is an imaginary disease made up by our instructor 15. Which of following statements about membranes is correct? A Molecules can freely diffuse across membranes B Molecules can cross membranes in the direction from high to low concentration in a protein-facilitated process called active transport C Molecules can cross membranes in the direction from low to high concentration in a protein-facilitated process called active transport 16. Which of the following is a characteristic of active transport? A A substance is moved from high to low concentration B A substance is moved from low to high concentration C The transport requires ATP D A and C E B and CBMB200 FS15 Final exam (100 pts) FORM A 17. Below is a reaction from one of the pathways we studied in class. It proceeds in the direction indicated, left to right. What is the best classification for this reaction? A Group transfer – transferring a functional group from one molecule to another B Hydrolysis – using water to cleave one molecule into two molecules C Isomerization – rearranging the bonds within a molecule to produce an isomer D Reduction/Oxidation – transferring electrons from one molecule to another E Lyase – putting together or breaking apart molecules using a double bond 18. The above reaction demonstrates a specific way to make ATP. What process is demonstrated above? A Oxidative phosphorylation B Substrate level phosphorylation C Photophosphorylation D Catabolic phosphorylation E Substrate activation 19. Phosphofructokinase (PFK) is an enzyme that catalyzes the reaction at the commitment step of glycolysis. PFK is by definition an allosteric enzyme. Which of these statements gives supporting evidence to classify PFK as an allosteric enzyme? A PFK catalyzes only reactions that occur in catabolic pathways. B PFK is part of a substrate cycle with another enzyme. C The delta G of the reaction in which PFK is involved is highly negative. D The activity of PFK is reduced in the presence of high concentrations of ATP. E PFK catalyzes a reaction that can lead to several different pathways. 20. PFK is a kinase. In general, what types of reactions are catalyzed by kinase enzymes? A Transfer of a phosphate group from


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MSU BMB 200 - BMB200_FS15_finalexam_allforms

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