practiceexam - PRACTICE EXAM 1. Albumin a) a blood protein...

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PRACTICE EXAM 1. Albumin a) a blood protein that carries fatty acids and sometimes drugs b) carries oxygen in the blood stream c) delivers sterols such as cholesterol through the cell membrane d) a cell bound receptor e) is an enzyme 2. A contraction protein a) mucin b) actin c) tubulin d) enkephalin e) elastase 2. An amino acid with a pI of 3 could have the following set of pKas. a) 2, 3, 4 b) 2, 3, 9 c) 2, 4, 10 d) 1, 4, 9 e) 3 and 10 4. The effective range of a buffer is: a) whenever the buffer is predominantly a zwitterion b) when the buffer is mostly in its basic form c) high concentrations of either weak acid or base d) within 1 pH unit of its pI e) within 1 pH unit of its pK a 5. Which of the following amino acids is aliphatic nonpolar? a) tyrosine b) glutamate c) isoleucine d) asparagine e) methionine 6. A small naturally occurring peptide. 1
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a) gentian b) pepsin c) glutathione d) keratin e) tryptophan 7. Which of the following amino acids pairs are aromatic? a) valine and histidine b) tryptophan and isoleucine c) tyrosine and proline d) histidine and proline e) tyrosine and tryptophan 8. In an electric field, using a buffer of pH = 6.0, an amino acid with a pI of 9 will a) migrate to the anode (+) b) migrate to the cathode c) not move d) decompose e) migrate until its charge matches the buffer = s. 9. The accompanying dipeptide is: O O a) glutaminylthreonine + H 3 NC-C-NH-C-C-O - b) aspartylthreonine CH 2 HCOH c) glutamylthreonine COO - CH 3 d) asparaginylthreonine e) threonylaspartate 10. Which is NOT true of an α -helix? a) stabilized by H-bonds between an amide N and a C=O of the peptide backbone. b) characterized by repetitions of the same angles phi and psi. c) can accommodate any of the common amino acids within. d) found in hemoglobin. e) right handed helix with 3.6 amino acids per turn. 2
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11. The effect of heat on proteins: a) denaturation b) chaotropic c) thermal transposition d) heat capacity e) tropomysin 12. Which amino acid cannot be in the middle of an alpha-helix? a) alanine b) glycine c) phenylalanine d) histidine e) proline 13. Which term best describes the beta -structure relative to an alpha-helix? a) much less common
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practiceexam - PRACTICE EXAM 1. Albumin a) a blood protein...

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