At a pH greater than that of its isoelectric point, the structure of glycine is a)...
2) At a pH greater than that of its isoelectric point, the structure of glycine is a) H-CH-COOH b) H-CH-C00- c) H-CH-CO e) H-CH-COO COOH b) H-CH-C00- c) H-CH-COOH d) H-CH-COO NH2 NH2 NH2 NH3 NH 3) Which of the following structures can be destroyed by the dena structures can be destroyed by the denaturation of a protein? a) Only primary and tertiary structures of a protein. b) Only secondary, tertiary y secondary, tertiary, and quaternary structures of a protein....
m ical reactions 8) Which of the following represents an amino acid in a basic solution (pH-11)? A) R-CH-COOR -CH-COOH ENH2 R--CH-COOH R-CH-coo C) NH3 D) 3NH3 9) Which of the following is a zwitterion? B) NH2 R-CH-Coo E) NH2 A) R-CH-COO R-ch-cool R-ca-cooH R-ch-coo H2B) NH2C) NH3 D) NH3 R-ca-coo E) NH2 10) Which of the following amino acids has the lowest isoelectric point? A) glutamic acid B) lysine C) valine D) glycine E) methionine 11) Calculate the isoelectric...
36. Calculate the pl and identify which structure is at isoelectric point H.N -ċ-COOH pka HN - ċ-Coo- pkar H.N-C-COO CH соон COOH COO- pKa, HN - C-COO- CH CH 9.8 coo-
Amino Acids SW C2 9. Which of the following is an L-amino acid? çoo coo coo HẠN |-R HANH, HẠN –H HÀNH R coo B. 10. The following questions refer to the structures A-E below: (a) Which represents the structure of an amino acid at very high pH? (b) Which is a zwitterion? (c) Which represents the structure of an amino acid at very low pH? (d) Which structure/(s) is/are) not possible? R-CH-COOR-CH-COOH R-CH-COOH R-CH-COOR -CH-COO NH2 NH2 *NH NH2...
What is the structural formula of glutamic acid (pl = 3.2) at pH = 1? O NH₂ H-¢-CH2-CH2-COOH COOH NH2 H- CH2-CH3 -COOH Coo Ô NH3 H-C-CH2-CH2-Coo Coo O NHO H-C-CH2-CH-COO coo H C -CH-CH2-COOH COOH MacBook Pro F4
no acid has the form shown at Team R CH ΝΗ, A) a pH of 7.0. B) any pH other than 7.0. C) a pH greater than its isoelectric point. D) its isoelectric point. E) a pH less than its isoelectric point. 18. The N-terminal amino acid in the peptide ala-leu-gly-his-pro is A) Alanine. B) Leucine. C) Glycine. D) Histidine. E) Proline. 19. How many different tripeptides can be formed from one molecule each of the amino acids tyrosine, valine,...
* Give the structure of valine as it would exist at a pH above its isoelectric point. * Give the structure of valine as it would exist at a pH below its isoelectric point.
Consider the amino acid, glycine, in its fully protonated form + H3NCH2CO2H, where the pKa1 = 2.35 and pKa2 = 9.78. a) Ka2 is the equilibrium constant for the second dissociation of + H3NCH2CO2H. Write the chemical equation that illustrates this equilibrium. b) Write the structure for the major species at pH = 1.35. c) Write the structure for the major species at pH = 3.35. d) Write the structure for the major species at pH = 10.78. e) Calculate...
In a 0.1 M solution of glycine at pH 9.0, what fraction of glycine has its amino group in the -NH3+ form? I can't figure out how to get from 0.25=[NH2]/[NH3] to (0.25/[0.25+1]) x 100 = 20% Why do you divide by (0.25+1) ?
(10) (2) © © eg 2. Consider the amino acid, glycine, in its fully protonated form *H3NCH2CO2H, where the pka1 = 2.35 and pka2 = 9.78. a) Kaz is the equilibrium constant for the second dissociation of *H3NCH2CO2H. Write the chemical equation that illustrates this equilibrium. b) Write the structure for the major species at pH = 1.35. c) Write the structure for the major species at pH = 3.35. d) Write the structure for the major species at pH...