BMB 401-506 Fall 2007 Exam1KEY

BMB 401-506 Fall 2007 Exam1KEY - I, (Name) _ have neither...

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I, (Name) _________________________________________ have neither received nor given help. BMB 401/506-Fall 2007 Exam 1 September 18, 2007 During this exam you should not be in possession of any electronic equipment (beeper, cellular phone, earphone, iPods, etc.), books and papers, other than the test. Please place all these materials in your book bag (after you turn it off!!) and place the bag against the wall of the room. During exam 1 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 ANSWER MULTIPLE CHOICE QUESTIONS. THE POSSIBLE ANSWERS ARE LABELED A, B, C, D AND E. SELECT THE SINGLE BEST ANSWER AND MARK THE APPROPRIATE CIRCLE ON THE SCANTRON ANSWER SHEET. Bubble in your name and ID# (C# please) and seat number. There are 43 questions. You will receive full credit for 41 correct answers. 1. In figure 1 on page 5, identify 9- cis -retinoic acid. A 2. In an α-helix all of the following are correct EXCEPT: A. The –C=O group of each amino acid residue forms a hydrogen bond with the NH group of the amino acid that is situated four residues ahead in the sequence of the same polypeptide chain. B. Side chains of amino acids 1 and 4, 2 and 5, etc. are hydrogen bonded. C. Side chains radiate out from the helix. D. Some amino acids are more prevalent in these helices than others. E. There are close to four amino acid residues per turn. 3. The side-chain of an asparagine residue in a protein: (all statements are correct EXCEPT) A. Can be positively charged B. Can act as a hydrogen bond donor through a hydrogen attached to nitrogen C. Can act as a hydrogen bond acceptor at the =O D. Can act as a hydrogen bond acceptor at its nitrogen E. Is polar 4. Which of the following represents a peptide bond? A. -(NH 2 )-(CHOH)-CO- B. -(C=O)-NH 2 -(CHR)- C. -(OH)-NH 2 -C=O D. -(C=O)-(CHR)-NH 2 E. All of the above 5. Which of the following amino acids can carry a carbohydrate side chain A. Asp, Gly, Ser B. Glu, Gln, Thr C. Ser, Thr, Asn D. Ser, Thr, Tyr E. Tyr, Trp, Lys 6. Whether or not an amino acid will carry a side-chain carbohydrate depends on A. The context of the amino acid (i.e. its neighbors and near neighbors) in the primary structure B. Whether the protein passes through the endoplasmic reticulum and Golgi apparatus of the cell. C. Both A and B are correct D. Neither A nor B are correct. 7. All of the following are amphipathic molecules EXCEPT: A. Beta carotene B. Fatty acids C. Phenylalanine D. Phospholipids E. Valine 8. Which amino acid side chain can be positively charged at neutral pH? A.
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BMB 401-506 Fall 2007 Exam1KEY - I, (Name) _ have neither...

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