2017 Multiple Choice: 1. The peptide alanylglutamylglycylalanylleucine has: A) a disulfide bridge. B) five peptide bonds. C) four peptide bonds. D) no free carboxyl group. E) two free amino groups. 2. Amino acids are ampholytes because they can function as either a(n): A) acid or a base. B) neutral molecule or an ion. C) polar or a nonpolar molecule. D) standard or a nonstandard monomer in proteins. E) transparent or a light-absorbing compound. 3. In a mixture of the five proteins listed below, which should elute forth in size-exclusion (gel- filtration) chromatography? A) cytochrome c B) immunoglobulin C C) ribonuclease A D) RNA polymerase E) serum albumin M= 13.000 = 145,000 M= 13.700 M, 450,000 M 68,500 4. Proteins often have regions that show specific, coherent patterns of folding or function. The regions are called: A) domains. 8) oligomers. ) peptides ) sites. subunits
