a) Which pH (1, 7 or 10) would produce the following ionization states for lysine?Th pK of the amine, carboxylic acid, and side-chain are 8.95, 2.18 and 10.53, respectively. A B H2N. HN. `OH *NH3 NH, NH3
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- b) Determine which ionization state corresponds to aspartic acid (shown below) at pH 1, 7, and 10 by selecting the most suitable answer from the statements i-iv. The pK of the amine, carboxylic acid, and side chain of aspartic acid are 9.6, 1.88 and 3.65, respectively. ОН ÓH ÑH2 i) the amine is charged; the carboxylic acids are neutral. ii) the amine and carboxylic acids are all charged. iii) the amine is neutral, and the carboxylic acids are charged. iv) the amine and the carboxylic acids are all neutral. pH Statement (i, ii, iii, or iv) 1 7 10 %3DThe skeletal structures of the two amino acids, glycine and lysine, are given below along with the values of the relevant acid dissociation constants (pKa). NH,* PK, - 10.79 - HạN*CH2CO,¯ S pK¸=2.35 (CH2)4 - H3N*CHCO,- pK,=9,78 lysine (Lys) glycine (Gly) pK, = 9.18 pK, - 2.16 For an aqueous solution of glycine alone, calculate the value of pH at which the ratio of the concentration of neutral glycine zwitterions to the concentration of protonated cation is 102. On your under each of the following conditions. In the blank, provide the total charge of the dipeptide. (Example: If the charge is two plus write the answer simply as 2, if the charge is negative two write the answer as -2). draw the skeletal structure of the dipeptide, Lys-Gly, when it is solvated in an aque us solution i. pH= 1 ii. pH= 12What is the pH of a glycine solution in which the alpha-carboxyl group is one third dissociated? Given pka1=2.3, pka2=9.6
- The following amino acid is dissolved in solution at pH 7.4. HC H' + CH CH₂ H/ H+ HC a. Which amino acid is this? (all lower case) N- H CH CH₂ b. What is the pKa of its ionizable side chain? (Use the value from the textbook.) c. What is the ratio of the uncharged to the charged form at pH 7.4? (write answer as number with one decimal place, ex 2.5 or 0.2 or 50.0 with an implicit "to 1")What is the net average charge on the predominant form of lysine at pH values of (a) 2.0, (b) 5.0 and (c) 7.0? CLUE: draw the structure of lysine and show its different charged forms; then consider in which pH domains the pKa values for deprotonation/protonation occur.Given the following information about amino acid tyrosine answer questions 1 & 2: A. O H HO OH HO HO рказ 10.1 H NH₂ CH₂OH A. NH3 С. НО 1. Which of the above forms of tyrosine will be predominant in a solution with pH 9.5? 2. Which of the above forms of tyrosine is a cation? Answers to Questions 3 & 4 should be selected from the following choices: CH₂OH Holl O OH B. NH₂ pka2 9.01 conj acid OH В. НО "OH D. HO HO H OH pka1 2.2 O H -OH CH₂OH C. NH3 HO NH₂ O HO OH D. 3. Which of the monosaccharides above is a non-reducing sugar? 4. Which of the monosaccharides above is an aldotetrose? 5. What is the main functional group in a protein? ||||OH
- The amino acid arginine ionizes according to the following scheme: NH₂ I C=N I ΝΗ Part A pl = Submit H (CH₂)3 H-N-C-COOH II HH 1 [ΠΙ ΑΣΦ H H Calculate the isoelectric point of arginine. Express your answer using three significant figures. Request Answer pk-2.17 -H* +H* wwwww NH₂ C=N ΝΗ H (CH₂)3 1 ? H H-N-C-COO- | | H H 11 H pk-8.99 -H* +H* NH₂ I C=N I ΝΗ T (CH₂)3 H H H₂N-C-COO- I H pk - 12.5 -H* +H* NH₂ C=N=H NH I (CH₂)3 H₂N-C-COO- I H IVGlutamic acid (1one of the 20 amino acids) has a side- chain carboxyl group (COOH, pKa = 4.3) as shown in Figures 4.7 and 4.8 a. Write the chemical equation for the dissociation of the side chain COOH. Label the weak acid and the conjugate base. b. The Henderson-Hasselbalch Equation (shown below) can be used to determine the ionization status of a weak acid: pH = pKa + log [base] Use the Henderson Hasselbalch equation to determine whether the glutamic acid side chain [acid] • carboxyl group is protonated or deprotonated at physiological pH.Which of the following define the stereochemistry of alanine (as per the structure shown)? Note: Functional groups arranged horizontally are facing towards the front, and the functional groups arranged vertically are facing towards the back. СООН + H₂N to OS- Od- CH, OR-
- e) What would be the predominant ionization states of this amino acid at physiological pH (7.4) and at this pH, what would the ratio of these two states be (show the calculation)?Consider the following dipeptides: AC HE TG LR VK How many of the dipeptides in this group that would stick to an anion exchange column at pH-8? Please give me the whole number as the answer, 0, 1, 2 etc Amino Acid pKac pKaN pKaR 9.8 9.9 97 2.4 Glycine Alanine 23 Valios 222Arginine has three ionizable groups. The pK of α-COOH is 2.18; α-NH 3 + , 9.09; and the R-group, 13.20. What is the isoelectric point of arginine?