6. Aspartic acid is similar to glutamic acid in the same way that a His is similar to pro b Ser is similar to Cys c GIn is similar to asn d Asn is similar to gin e Gly is similar to val 7. Alanine is similar to serine in the same way that a val is similar to Thr b Phe is similar to Tyr c Phe is similar to Trp d Ser is similar to Thr E Trp is similar to Pro 8. Glycine is similar to valine in the same way that a Ala is similar to leu b Thr is similar to met C Ala is similar to lle D Arg is similar to Lys e None of the above are valid similarities 9. A significant difference between His and Pro is that a the His side chain is aromatic, the pro side chain is aliphatIc b His is an a-amino acid Pro is an imino acid c the His side chain has a six-membered ring; Pro has a five-membered ring d the His side chain has a pK around ph=7; the pro side chain does not e All but the third choice are significant d ifferences 10. A significant difference between Phe and Tyr is that a the Phe side chain is aromatic, the Tyr side chain is aliphatic B Tyr is an a-amino acid; Phe is an imino acid c the Tyr side chain has an -OH group: the Phe side chain does not. d the Tyr side chain has a pK around pH=7; the Phe side chain does not e All but the third choice are significant differences ※<3> 1. The peptide bond in proteins a planar, but rotates to three preferred dihedral angles B nonpolar, but rotates to three preferred dihedral angles C nonpolar, and fixed in a trans conformation planar and usually found in a trans conformation. E not cleavable by hydrolysis6. Aspartic acid is similar to glutamic acid in the same way that A His is similar to Pro. B Ser is similar to Cys. C Gln is similar to Asn. D Asn is similar to Gln. E Gly is similar to Val. 7. Alanine is similar to serine in the same way that A Val is similar to Thr. B Phe is similar to Tyr. C Phe is similar to Trp. D Ser is similar to Thr. E Trp is similar to Pro. 8. Glycine is similar to valine in the same way that A Ala is similar to Leu. B Thr is similar to Met. C Ala is similar to Ile. D Arg is similar to Lys. E None of the above are valid similarities. 9. A significant difference between His and Pro is that A the His side chain is aromatic, the Pro side chain is aliphatic. B His is an a-amino acid; Pro is an imino acid. C the His side chain has a six-membered ring; Pro has a five-membered ring. D the His side chain has a pK around pH = 7; the Pro side chain does not. E All but the third choice are significant differences. 10. A significant difference between Phe and Tyr is that A the Phe side chain is aromatic, the Tyr side chain is aliphatic. B Tyr is an a-amino acid; Phe is an imino acid. C the Tyr side chain has an -OH group; the Phe side chain does not. D the Tyr side chain has a pK around pH = 7; the Phe side chain does not. E All but the third choice are significant differences. 5 ※<3> 1. The peptide bond in proteins is A planar, but rotates to three preferred dihedral angles. B nonpolar, but rotates to three preferred dihedral angles. C nonpolar, and fixed in a trans conformation. D planar, and usually found in a trans conformation. E not cleavable by hydrolysis