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Concept explainers
(a)
Interpretation: A condensed structural formula for the peptide, glycylalanine has to be drawn.
Concept introduction: In the IUPAC naming of a peptide, full name is written for the amino acid which is present on the far right. The other amino acid residues in the peptide receive “shortened” names that end in –yl. The –ine or –ic acid ending of the amino acid names is replaced by –yl.
(b)
Interpretation: A condensed structural formula for the peptide, cysteinylalanylglycine has to be drawn.
Concept introduction: In the IUPAC naming of a peptide, full name is written for the amino acid which is present on the far right. The other amino acid residues in the peptide receive “shortened” names that end in –yl. The –ine or –ic acid ending of the amino acid names is replaced by –yl.
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Chapter 20 Solutions
EBK GENERAL, ORGANIC, AND BIOLOGICAL CH
- Draw the structure of the PTH derivative product you would obtain by Edman degradation of the following peptides: (a) I-L-P-F (b) D-T-S-G-Aarrow_forwardThe oligopeptide isolated from the brain of an animal has the sequence glu-his-tri-ser-tyr-gly-leu-arg-pro-gly. Determine the total charge of the molecule at pH 3.0; 5.5; 11.0. In which pH range there is the isoelectric point of the peptide?arrow_forwardWrite the structure of the following peptides Expanded structure. Use any other ink for peptide bond. [For your reference download all the amino acids with the three and single letter symbol] a) leucyl glycyl leucyl alanine b) histidyl tyrosyl alanyl glycine c) glycyl phenylalanyl tyrosyl seryl histidinearrow_forward
- On the paper provided, draw the chemical structure of a peptide with a sequence LEMD at pH 7. The pKa values for the amino acid sidechain of E and D are 4.1 and 3.9, respectively.arrow_forwardName three biologically active peptides. Mention their functions.arrow_forwardClassify the fatty acid with the following structural formula in the ways indicated. a. What is the type designation (SFA, MUFA, or PUFA) for this fatty acid? b. On the basis of carbon chain length and degree of unsaturation, what is the numerical shorthand designation for this fatty acid? c. To which "omega" family of fatty acids does this belong? d. What is the "delta" designation for the carbon chain double-bond locations for this fatty acid? Note: There are 2 items in the photo.arrow_forward
- Classify the fatty acid with the following structural formula in the ways indicated.a. What is the type designation (SFA, MUFA, or PUFA) for this fatty acid? b. On the basis of carbon chain length and degree of unsaturation, what is the numerical shorthand designation for this fatty acid?c. To which “omega” family of fatty acids does this fatty acid belong? d. What is the “delta” designation for the carbon chain double-bond location for this fatty acid?arrow_forwardGiven the following peptides below, what would be more soluble at the indicated pH? 1. (Gly)20 or (Glu)20 in pH 7.0 2. (Lys-Ala)3 or (Phe-Met)3 in pH 7.0 3. (Gly)20 or (Glu)20 in pH 6.0|| 4. (Ala-Ser-Gly)s or (Asn-Ser-His)s in pH 6.0 5. (Ala-Asp-Gly)8 or (Asn-Ser-His)8 in pH 3.0arrow_forwardGive one specific sample structure (Fischer Projection or Haworth) of the following carbohydrate derivatives: - Amino-sugararrow_forward
- Consider a peptide with the sequence Ala-Glu-Arg-Leu. Assume the ionizable groups have the pKa values listed in Table 2.1 of your text. (a) Draw the predominant ionic form of the peptide at pH 7.4. (b) Determine the net charge of the predominant form of the peptide at pH 7.4. (c) Calculate the pI of the peptide.arrow_forwardThe peptide aspartyl-glutamyl-leucyl-threonyl-alanine shown in the sketch drawing window, has several ionizable groups. Adjust the charges to show the molecule as it would exist at pH 5.00. (I'm lost, I appreciate any help with explanation. ?)arrow_forwardWrite the chemical structure of peptide containing the following amino acid PRO-SER-GLY-LEUarrow_forward
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