Question: Which amino acids in Table 17.1 have nonpolar R groups? Highly polar groups? Relatively flat R groups? Table 17.1 QUESTION CONTINUE TO NEXT PAGE Table

Which amino acids in Table 17.1 have nonpolar R groups? Highly polar groups? Relatively flat R groups?
Table 17.1

QUESTION CONTINUE TO NEXT PAGE

Table 17.1 Names and Formulas of the Common Amino Acids Three-letter abbreviation (isoelectric point) one-letter abbreviation Name A. One amino group and one carboxyl group 1. glycine Formula Gly (6.0) H-CH-COH NH 2. alanine Ala (6.0) CH3 CH-CO,H Nh 3, valine Val (6.0) R is hydrogen or an alkyl group CH3CH-CH-CO,H NH2 4. feucine Leu (6.0) CH,CHCH,-CH-CO,H NH2 5, isoleucine Ile (6.0) CH CH2CH CH CO.H NH2 6. serine Ser (5.7) CH2 CH-CO,H NH 7. threonine Thr (5.6) CH,CH CH CO,H R contains an alcohol function 8. cysteine Cys (5.0) CH2 CH-CO,H SH NH CH3S- CH2CH2 CH CO,H 9, methionine Met (5.7) R contains sulfur NH2 Table 17.1 (continued) Three-letter abbreviation (isoelectric point) one-letter abbreviation Name Formula 10. proline Pro (6.3) The amino group is secondary and part of a ring CH2 CH COH CH NH 11. phenylalanine Phe (5.5) CH2 CH CO.H NH2 One hydrogen in alanine is replaced by an aromatic or 12. tyrosine Tyr (5.7) NH2 CH-CH-Co,H NH (indole) ring. 13. tryptophan Trp (5.9) B. One amino group and two carboxyl groups 14. aspartic acid Asp (3.0) HOOC-CH2-CH-CO2 H NHz 15. glutamic acid Glu (3.2) HOOC-CH2CH,-CH-CO,H 0 16. asparagine Asn (5.4) NH 0 17. glutamine Gln (5.7) NHa C. One carboxyl group and two basic groups 18, lysine Lys (9.7) CH2CH2CH2CH2-H-CO-H NH NH The second 19. arginine NH-GH,CH,CHCH-COH basic group is Arg (10.8) a primary amine a guanidine, or an imidazole NH 20. histidine His (7.6) N NH NH2

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