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rigure 3.18 The 20 amino acids of proteins. The amino acids are grouped here according to the properties of their side chains (R groups) and shown in their prevailing ionic forms at pH 7.2, the pH cell, The three-letter and one-letter abbreviations for the amino acids are in parentheses. Nonpolar side chains; hydrophobic Side chain (R group)· CH CHз CH3 CHз снз Сн CH2 H. сн, CH CH2 Нс — сн H3N*-C-C-O- H,N*-C-C-O Н.N*—С —С -о- H,N*-C-C-O НaN* - С —С-о- H. H. O. Н H. H O Glycine (Gly or G) Alanine Valine Leucine Isoleucine (Ala or A) (Val or V) (Leu or L) (Ile or I) NH CH2 CH2 Fash CH2 begrl Cн, Cн> H,C сн, H,N*-C-C-0- H,N* -C-C-0 Н,N* - С — С —О- H,N*-C-C-0 || 6rit wo H. Н но sipordy onh hoy d (Pro or P) Methionine Phenylalanine (Phe or F) d 3 Tryptophan o lo quong loodiso Proline oa (Met or M) b (Trp or W) orima brod baod obitgeryieg s ahla s చరాయ NH, O Polar side chains; hydrophilic NH2 Since cysteine is only weakly polar, it is sometimes classified as a nonpolar amino acid. Он CH2 SH ОН QH CH3 vcq a CH sis Cн CH2 Cн, CH2 CH2 НN*- С -С —о- НaN*- С —с-о- H,N*-C-C-0 Н.N* - C -с-о- ||| H O H,N* -C-C-O- H;N*-C-C-O- H O H. H O H O Glutamine Cysteine (Cys or C) Tyrosine (Tyr or Y) Asparagine (Asn or N) Serine Threonine in (Gln or Q) (Ser or S) (Thr or T) Electrically charged side chains; hydrophilic nsoilin Basic (positively charged) wions faunimi NH2 C=NH,* NH, CH2 Acidic (negatively charged) NH NH+ CH2 Cн> CH2 Cн NH CH2 ÇH2 CH2 Cн2 CH2 НEN*-C -C -о- CH2 Н.N*-С —с-о- H,N*-C-C-0- H3N*-C-C-0- |3| H O H,N*-C-C-O- но H. Histidine Lysine (Lys or K) Arginine (Arg or R) H O (His or H) Aspartic acid (Asp or D) Glutamic acid (Glu or E) 3.

rigure 3.18 The 20 amino acids of proteins. The amino acids are grouped here according to the properties of their side chains (R groups) and shown in their prevailing ionic forms at pH 7.2, the pH cell, The three-letter and one-letter abbreviations for the amino acids are in parentheses. Nonpolar side chains; hydrophobic Side chain (R group)· CH CHз CH3 CHз снз Сн CH2 H. сн, CH CH2 Нс — сн H3N*-C-C-O- H,N*-C-C-O Н.N*—С —С -о- H,N*-C-C-O НaN* - С —С-о- H. H. O. Н H. H O Glycine (Gly or G) Alanine Valine Leucine Isoleucine (Ala or A) (Val or V) (Leu or L) (Ile or I) NH CH2 CH2 Fash CH2 begrl Cн, Cн> H,C сн, H,N*-C-C-0- H,N* -C-C-0 Н,N* - С — С —О- H,N*-C-C-0 || 6rit wo H. Н но sipordy onh hoy d (Pro or P) Methionine Phenylalanine (Phe or F) d 3 Tryptophan o lo quong loodiso Proline oa (Met or M) b (Trp or W) orima brod baod obitgeryieg s ahla s చరాయ NH, O Polar side chains; hydrophilic NH2 Since cysteine is only weakly polar, it is sometimes classified as a nonpolar amino acid. Он CH2 SH ОН QH CH3 vcq a CH sis Cн CH2 Cн, CH2 CH2 НN*- С -С —о- НaN*- С —с-о- H,N*-C-C-0 Н.N* - C -с-о- ||| H O H,N* -C-C-O- H;N*-C-C-O- H O H. H O H O Glutamine Cysteine (Cys or C) Tyrosine (Tyr or Y) Asparagine (Asn or N) Serine Threonine in (Gln or Q) (Ser or S) (Thr or T) Electrically charged side chains; hydrophilic nsoilin Basic (positively charged) wions faunimi NH2 C=NH,* NH, CH2 Acidic (negatively charged) NH NH+ CH2 Cн> CH2 Cн NH CH2 ÇH2 CH2 Cн2 CH2 НEN*-C -C -о- CH2 Н.N*-С —с-о- H,N*-C-C-0- H3N*-C-C-0- |3| H O H,N*-C-C-O- но H. Histidine Lysine (Lys or K) Arginine (Arg or R) H O (His or H) Aspartic acid (Asp or D) Glutamic acid (Glu or E) 3.

Biology 2e
Biology 2e
2nd Edition
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter3: Biological Macromolecules
Section: Chapter Questions
Problem 23CTQ: Amino acids have the generic structure seen below, where R represents different carbon-based side...
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Study figure 3.18 in the textbook. See if you can understand why some R groups are nonpolar, some polar, and others electrically charged (acidic or basic). If you were given an R group, could you place it in the correct group? Work on the R groups until you can see common elements in each category.

rigure 3.18 The 20 amino acids of proteins. The amino acids are grouped here according to the properties of their side chains (R groups) and shown in their prevailing ionic forms at pH 7.2, the pH cell, The three-letter and one-letter abbreviations for the amino acids are in parentheses. Nonpolar side chains; hydrophobic Side chain (R group)· CH CHз CH3 CHз снз Сн CH2 H. сн, CH CH2 Нс — сн H3N*-C-C-O- H,N*-C-C-O Н.N*—С —С -о- H,N*-C-C-O НaN* - С —С-о- H. H. O. Н H. H O Glycine (Gly or G) Alanine Valine Leucine Isoleucine (Ala or A) (Val or V) (Leu or L) (Ile or I) NH CH2 CH2 Fash CH2 begrl Cн, Cн> H,C сн, H,N*-C-C-0- H,N* -C-C-0 Н,N* - С — С —О- H,N*-C-C-0 || 6rit wo H. Н но sipordy onh hoy d (Pro or P) Methionine Phenylalanine (Phe or F) d 3 Tryptophan o lo quong loodiso Proline oa (Met or M) b (Trp or W) orima brod baod obitgeryieg s ahla s చరాయ NH, O Polar side chains; hydrophilic NH2 Since cysteine is only weakly polar, it is sometimes classified as a nonpolar amino acid. Он CH2 SH ОН QH CH3 vcq a CH sis Cн CH2 Cн, CH2 CH2 НN*- С -С —о- НaN*- С —с-о- H,N*-C-C-0 Н.N* - C -с-о- ||| H O H,N* -C-C-O- H;N*-C-C-O- H O H. H O H O Glutamine Cysteine (Cys or C) Tyrosine (Tyr or Y) Asparagine (Asn or N) Serine Threonine in (Gln or Q) (Ser or S) (Thr or T) Electrically charged side chains; hydrophilic nsoilin Basic (positively charged) wions faunimi NH2 C=NH,* NH, CH2 Acidic (negatively charged) NH NH+ CH2 Cн> CH2 Cн NH CH2 ÇH2 CH2 Cн2 CH2 НEN*-C -C -о- CH2 Н.N*-С —с-о- H,N*-C-C-0- H3N*-C-C-0- |3| H O H,N*-C-C-O- но H. Histidine Lysine (Lys or K) Arginine (Arg or R) H O (His or H) Aspartic acid (Asp or D) Glutamic acid (Glu or E) 3.
Transcribed Image Text:rigure 3.18 The 20 amino acids of proteins. The amino acids are grouped here according to the properties of their side chains (R groups) and shown in their prevailing ionic forms at pH 7.2, the pH cell, The three-letter and one-letter abbreviations for the amino acids are in parentheses. Nonpolar side chains; hydrophobic Side chain (R group)· CH CHз CH3 CHз снз Сн CH2 H. сн, CH CH2 Нс — сн H3N*-C-C-O- H,N*-C-C-O Н.N*—С —С -о- H,N*-C-C-O НaN* - С —С-о- H. H. O. Н H. H O Glycine (Gly or G) Alanine Valine Leucine Isoleucine (Ala or A) (Val or V) (Leu or L) (Ile or I) NH CH2 CH2 Fash CH2 begrl Cн, Cн> H,C сн, H,N*-C-C-0- H,N* -C-C-0 Н,N* - С — С —О- H,N*-C-C-0 || 6rit wo H. Н но sipordy onh hoy d (Pro or P) Methionine Phenylalanine (Phe or F) d 3 Tryptophan o lo quong loodiso Proline oa (Met or M) b (Trp or W) orima brod baod obitgeryieg s ahla s చరాయ NH, O Polar side chains; hydrophilic NH2 Since cysteine is only weakly polar, it is sometimes classified as a nonpolar amino acid. Он CH2 SH ОН QH CH3 vcq a CH sis Cн CH2 Cн, CH2 CH2 НN*- С -С —о- НaN*- С —с-о- H,N*-C-C-0 Н.N* - C -с-о- ||| H O H,N* -C-C-O- H;N*-C-C-O- H O H. H O H O Glutamine Cysteine (Cys or C) Tyrosine (Tyr or Y) Asparagine (Asn or N) Serine Threonine in (Gln or Q) (Ser or S) (Thr or T) Electrically charged side chains; hydrophilic nsoilin Basic (positively charged) wions faunimi NH2 C=NH,* NH, CH2 Acidic (negatively charged) NH NH+ CH2 Cн> CH2 Cн NH CH2 ÇH2 CH2 Cн2 CH2 НEN*-C -C -о- CH2 Н.N*-С —с-о- H,N*-C-C-0- H3N*-C-C-0- |3| H O H,N*-C-C-O- но H. Histidine Lysine (Lys or K) Arginine (Arg or R) H O (His or H) Aspartic acid (Asp or D) Glutamic acid (Glu or E) 3.
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