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- Ⓒ Macmillan Learning Consider the structure of methionine in its +1 charge state. i H³N-H _—__—_—_v_€² CH₂ CH₂ S CH3 OH Give the pK₂ value for the a-amino group of methionine. An answer within +0.5 units is acceptable. Give the pK, value for the α-carboxyl group of methionine. An answer within +0.5 units is acceptable. pKa (−NH;) =| 9.2 Incorrect pK₂ (-COOH) = 2.2 Incorrect Attempt 3Consider the tripeptide phenylalanylcysteylmethionine. Part: 0/2 Part 1 of 2 Draw the structure of this tripeptide at physiological pH. Click and drag to start drawing a structure. C™ č XWhat is the structure that best represents the following amino acid at pH = 10? wolzle H₂N NH₂ O A A HN H₂N B NH₂ i NH₂ OH H₂N C NH3 H₂N NH₂ D OH
- Choose from A-F. Two of this amino acid can react with each other (anoxidation reaction) and form a covalent bond. CO- COO COO H3N-C-H H,N-C-H CH2 H2N CH 2 Н-С—он CH2 H2C CH2 CH3 CH3 Choice "A" Choice "B" Choice "C" Coo H,N-C-H H,N-C-H H3N-C-H CH2 CH2 C=CH NH CH2 C-NH | CH SH C-N H Choice "E" Choice "F" Choice "D"Draw an a amino acid with an isopropyl (-CH(CH3)2) Continue side chain. Click and drag to start drawing a structure. C с с X 3 官 cx ĆChoose the set of letters corresponding to the BEST answer. H₂N- CH CH₂ OH GLU 。 an achiral amino acid a basic amino acid an acidic amino acid a cyclic amino acid -OH - OH H₂N- pla 貼士 ·CH- CHS HN PRO H₂N-CH C OH CH₂ -NH HIS [Choose] Choose [Choose] | Choose H₂N-CH- H GLY -OH ALA
- A novel new method of peptide synthesis involves formation of an amide bond by reaction of an a-keto acid with an N-alkylhydroxylamine. OH R CO2 R' R R' + CO2 + H2O Draw curved arrows to show the movement of electrons in the following step of the reaction mechanism. Arrow-pushing Instructions X R :0: :O: R' H:OH H-A بد R :O: Nx- R' H2O CO2 A H- (1828. Consider the peptide below and the acidic protons labeled A-C. One pK, is given in parentheses below the proton label. For each base below, choose which proton(s) would be removed with a K > 10³ and place the letter(s) in each box. eq 1フーメニ3 Nit₂ R₂ NaOCH3 11-x=3 27 (→ NH₂ NaCl HCI A B C Ас -7 66 Unit 3: Introduction to Organic Reactions 11 Its t 11 B HS. + H3N A (8) OH 5 a Hat S 3 77 --x=3 -7-11= -40Amino Acids and proteins N- H. 1. What is the structure above? RIOIH
- Which of the following amino acids is polar acidic? OH CH3 CH, H-C-OH H,C CH-C-0 NH H-N-C-C-0 H,N-C-C-O H O но C=CH CH2 CH, H3N*-C-C-O- H,N-C-C-o H O H O a b. C. e O a O b O d O eFor each amino acid [RCH(NH2)COOH], draw its neutral, positively changed, and negatively charged forms. Which form predominates at pH = 1, 6, and 11? What is the structure of each amino acid at its isoelectric point?a. methionine (R = CH2CH2SCH3)b. serine (R = CH2OH)Match the following amino acids with their chemical properties H -N-CIC- A -A ✓ B но с D VE ✓ F ✓ G / CH3 CH3 CH B H но -N-C-C- feed C но -N-C-C- H CH₂ D HO -N-CIC- 1 H CH₂ OH E но ||| -N-C-C- II H CH₂ I CH₂ CH₂ CH₂ T NH3 I. Acidic II. Nonpolar III. Polar uncharged IV, Basic + F O HO -N-C-C- H CH₂ NH₂ G но | || -N-C-C- I H CH₂ 1
