BMB401 F06 T1 KEY

BMB401 F06 T1 KEY - I, (Name) _ have neither received nor...

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I, (Name) _________________________________________ have neither received nor given help BMB 401/506-Fall 2006 Examination I September 19, 2006 KEY During this exam you should not be in possession of any electronic equipment (beeper , cellular phone, earphone, 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 42 questions. You will receive full credit for 40 correct answers. 1. Which of the following is considered as a non-covalent bond? A. Hydrogen bonds B. Electrostatic interactions C. van der Waals interactions D. None of the above E. All of the above 2. What pairs of atoms in amino acids present in a polypeptide are involved in hydrogen bonds? A. N-H and O-H B. N-H and C=O C. O-H and C=O D. All of the above 3. What happens to non-polar, hydrophobic molecules in water? A. They dissolve independently B. They aggregate together C. They precipitate D. None of the above 4. What determines a protein’s function? A. N-terminal amino acid B. C-terminal amino acid C. Primary structure D. None of the above 5. What is the approximate mass of a protein containing 300 amino acid residues? A. 30,000 B. 33,000 C. 39,000 D. 42,000 6. Which of the following is true? A. Membranes are lipid bilayers B. Membrane lipids have both hydrophilic and hydrophobic properties C. Membrane lipids are electrically polarized D. All of the above 7. The degree of membrane fluidity depends on A. The percentage of lipids that contain choline B. The percentage of glycolipids C. The percentage of free fatty acids D. The percentage of unsaturated fatty acids present in membranous lipids E. None of the above 8. In membrane phospholipids, unsaturated fatty acid is usually esterified to which hydroxyl group of the glycerol moiety? A. Located at position 1 B. Located at position 2 C. Located at position 3 D. Located at position 1 and 3 9. Examples of second messengers include: A. Calcium ions B. cAMP C. cGMP D. Diacylglycerol E. All of the above 10. Most signal molecules: A. Easily diffuse through the membrane and bind to a receptor in the cytoplasm B. Bind to membrane receptors and transmit information across a membrane without traversing the membrane C. Carry out functions in the nucleus after binding to a receptor in the cell membrane D. None of the above 11. Which of the following amino acids can be phosphorylated? A.
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BMB401 F06 T1 KEY - I, (Name) _ have neither received nor...

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