1. Classify the 20 common amino acids B. According to Polarity d. Uncharged nonpolar e. Uncharged polar f. Charged polar
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- 29. Amino Acid Chemistry: Using the amino acid chart provided..Ala-Lys-Cys & give the isoelectric point for the tripeptide. Table 23.2 The pK, Values of Amino Acids pk, a-COOH a-NH3* Amino acid side chain Alanine 2.34 9.69 2.17 9.04 12.48 Arginine Asparagine 2.02 8.84 3.86 Aspartic acid Cysteine 2.09 9.82 1.92 10.46 8.35 Glutamic acid 2.19 9.67 4.25 Glutamine 2.17 9.13 Glycine 2.34 9.60 1.82 9.17 6.04 Histidine 2.36 9.68 Isoleucine Leucine 2.36 9.60 2.18 $ 95 10.79 Lysine 2.28 9.21 Methionine 16 9.18 Phenylalanine 1.99 10.60 Proline 2.21 9.15 Serine 2.63 9.10 Threonine 2.38 9.39 Tryptophan Tyrosine 9.11 10.07 2.20 2.32 9.62 Valine O something else! 5.14 O 8.65 something else! 5.81 9.02 9.57Which of the following is not true about a-amino acids? have at least 2 pka values O negatively charged at pH = 1.0 most contain one chiral center can act as buffersHN 1. 2. 3. 4. 5. NH CH₂ H₂N-C-COO H Choose A if the statement is CORRECT B if the statement is WRONG € NH3 I CH₂ I CH₂ I CH₂ L CH₂ H₂N-C-COO H e The first amino acid is basic. The second amino acid is acidic. The third amino acid is positively charged. The second amino acid is zero charge, a zwitterion. These amino acids are H, L, and R. NH₂ C=NH, NH L CH₂ L CH₂ L CH₂ H₂N-C-COO H
- . Consider the structure of the amino acid aspartic acid. Indicate the hybridization about each interior atom. H H2. Amino Acid Stereochemistry. Hypothetical Situation: A novel amino acid is isolated from a hyperthermophilic bacterium discovered in Lassen National Park. The discovery is published in the Journal Science by a group of microbiologists from the CSU-Chico Department of Biology. The amino acid structure is shown below. H₂N- HO Ç CH₂ C1H OH CH₂ (a) Designate the stereochemical configuration (R or S) of all the chiral centers in the molecule. (b) is this a D- or L-amino acid? Would you expect to find it as part of a polypeptide? Why or why not?H. N-C-C Choose A if the statement is CORRECT B if the statement is WRONG H он CH, This amino acid is/has: CH2 6. polar CH2 | CH2 | NH, _7. charged 8. basic side chain 9. aromatic side chain 10. K
- HO. NH2 HO This amino acid is called It's three-letter abbreviation is and its one-letter abbreviation is9. Use pKa values from the table to calculate isoelectric points for these three amino acids. CH3 of NH H2N. H3C HO. HO, HO, NH2 NH2 Valine Proline Lysine02-CH-CH Gln12 Regions of 2 receptors that interact on dimerization are shown below. Identify the types of interactions between amino acids based on their interacting side chains (figures of amino acids also provided). Receptor 1 Cys36 Cys$2 CH2 Receptor 2 HS-H2 S-CH Ala45 CH, Cys75 Asp68 HN-CH-CH-CH-CHst Lys65 CH Ser53 -CH,-OH HN CH H,C Phe50 Val98 Interacting Amino Acids Type of Interaction Ser53:Gln12 Asp68:Lys65 Cys75:Cys82 Phe50:Val98 Amino Acids: H. H-C-CH,- H-C-CH, H-C-CH,CH,CCH,-N,
- When a protein folds into a quaternary structure the outside amino acids are exposed to the aqueous (water rich) environment. These amino acid R likely have what chemical properties? O The amino acid R groups are polar and hydrophilic The amino acid R groups are non-polar and hydrophobic O The amino acid R groups have hydrocarbon functional groups O The amino acid R groups have unreactive functional groups6. Quaternary structure. Oligomeric and polymeric proteins. Formation of a quaternary structure of proteins from several domains. Chemical bonds that form and stabilize a given structure.Optical isomerism of amino acids. L and D amino acids. Chiral centers of amino acids. Give examples of amino acids that do not have optical isomers.