BMB258 S06 T2 KEY

BMB258 S06 T2 KEY - NAME(Please print BMB 258 EXAMINATION...

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NAME: _____________________ (Please print) BMB – 258 - EXAMINATION II March 28, 2006 KEY During this exam you should not be in possession of a beeper or a cellular phone. Please place your beeper or cellular phone in your book bag (after you turn it off!!) and place the bag against the wall of the room. You can only use calculators that do not have memory capabilities for alphabetic characters. Other calculators should also be placed in your bag. THESE ARE STANDARD SINGLE ANSWER MULTIPLE CHOICE QUESTIONS. THE POSSIBLE ANSWERS ARE LABELED A, B, C, D AND E. SELECT THE SINGLE BEST ANSWER FOR QUESTIONS 1- 24 AND FILL IN THE CORRESPONDING CIRCLE ON THE SCANTRON SHEET. PRINT YOUR NAME ON THIS PAGE AND ON EACH OF THE SHORT ANSWER / FILL-IN PAGES. 1. The citric acid cycle performs all but one of the following functions. Which one? A. synthesis of GTP B. synthesis of urea C. supplies an intermediate for glucose synthesis D. supplies reduced coenzymes to the electron transport chain E. supplies carbon skeletons for amino acid synthesis 2. Which molecule reacts with itself to form ketone bodies? A. acetyl coenzyme A B. oxaloacetate C. pyruvate D. α-ketoglututrate E. citrate 3. Which macromolecule(s) need to be totally digested before being absorbed from the digestive system? A. starch B. protein C. lipids D. A + B E. A + C 4. Which of the following is an intermediate through which breakdown products of carbohydrates, fats and proteins enter the citric acid cycle? A. lactate B. pyruvate C. oxaloacetate D. acetyl coenzyme A E. acetoacetate 5. Which is the pacemaker enzyme of aerobic glycolysis? A. hexokinase B. phosphofructokinase C. pyruvate kinase D. glucokinase E. succinate thiokinase 1 of 8
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6. In anaerobic glycolysis, lactate dehydrogenase is used to regenerate an essential coenzyme. Which one? A. FADH 2 B. NAD + Lactase dehydrogenase regenerates NAD+, not NADH C. NADH D. NADP + E. NADPH 7. Which set of purine and pyrimidine bases is commonly found in the structure of RNA? A. ATCG B. ATC C. ATG D. AUGC E. TCG 8. The function of single strand binding protein is to A. Protect proteins before they are folded B. Unwind double-stranded DNA C. Protect single-stranded DNA, especially while the lagging strand is being copied. D. Unwind double stranded RNA E. Protect mRNA from endonucleases while protein is being synthesized by polysomes. 9. What is the most expensive process in terms of high-energy phosphate bonds in ATP, GTP or other nucleoside triphosphates hydrolyzed per one unit added to the polymer? A. Addition of one amino acid residue to a growing peptide chain. B. Addition of one deoxynucleotide to a growing DNA strand C. Addition of one nucleotide to a growing RNA molecule D. All are equally expensive E. The question can not be answered without specific information about the (deoxy)nucleotide or amino acid to be added. 10.
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This document was uploaded on 11/04/2011 for the course BMB 258 at University of Miami.

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BMB258 S06 T2 KEY - NAME(Please print BMB 258 EXAMINATION...

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