Organic Chemistry
9th Edition
ISBN: 9781305080485
Author: John E. McMurry
Publisher: Cengage Learning
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Chapter 26.2, Problem 4P
Hemoglobin has pI=6.8. Does hemoglobin have a net negative charge or net positive charge at pH=5.3? At pH=7.3?
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The chemical structure of oxamide
NH,
is shown below. Highlight each atom that is
an amino group.
:0::0:
C
C –N –H
|
H –N –H
H
The first step in the procedure asks you to prepare five dilutions of the protein standard (BSA) in the range of 0.2 to 1.0 mg/ml. For each concentration, a volume of 1.0 mL should be prepared. Describe how you will prepare these standards using a stock solution of BSA that is 2.0 mg/ml.
What charged groups are present in lysine at a pH = 7?
OA) 1× NH3
B) 1 x COO™
OC) 1× NH3* and 1 x COO-
D) 2× NH3 and 1 x COO-
OE) 1× NH3+ and 2 x COO-
OF) None
Chapter 26 Solutions
Organic Chemistry
Ch. 26.1 - How many of the -amino acids shown in Table 26-1...Ch. 26.1 - Prob. 2PCh. 26.1 - Prob. 3PCh. 26.2 - Hemoglobin has pI=6.8. Does hemoglobin have a net...Ch. 26.3 - Show how you could prepare the following -amino...Ch. 26.3 - What alkyl halides would you use to prepare the...Ch. 26.3 - Prob. 7PCh. 26.4 - There are six isomeric tripeptides that contain...Ch. 26.4 - Draw the structure of M-P-V-G, and indicate its...Ch. 26.5 - Prob. 10P
Ch. 26.5 - Prob. 11PCh. 26.6 - The octapeptide angiotensin II has the sequence...Ch. 26.6 - Prob. 13PCh. 26.6 - Prob. 14PCh. 26.6 - Give the amino acid sequence of hexapeptides that...Ch. 26.7 - Prob. 16PCh. 26.7 - Write all five steps required for the synthesis of...Ch. 26.10 - Prob. 18PCh. 26.SE - Identify the following amino acids:Ch. 26.SE - Prob. 20VCCh. 26.SE - Isoleucine and threonine are the only two amino...Ch. 26.SE - Prob. 22VCCh. 26.SE - Give the sequence of the following tetrapeptide:Ch. 26.SE - Prob. 24MPCh. 26.SE - The chloromethylated polystyrene resin used for...Ch. 26.SE - Prob. 26MPCh. 26.SE - Prob. 27MPCh. 26.SE - Prob. 28MPCh. 26.SE - Except for cysteine, only S amino acids occur in...Ch. 26.SE - Prob. 30APCh. 26.SE - Prob. 31APCh. 26.SE - Show the structures of the following amino acids...Ch. 26.SE - Prob. 33APCh. 26.SE - Using both three- and one-letter codes for amino...Ch. 26.SE - Prob. 35APCh. 26.SE - Show how you could use the acetamidomalonate...Ch. 26.SE - Prob. 37APCh. 26.SE - Show how you could prepare the following amino...Ch. 26.SE - Prob. 39APCh. 26.SE - Predict the product of the reaction of valine with...Ch. 26.SE - Prob. 41APCh. 26.SE - Prob. 42APCh. 26.SE - Propose two structures for a tripeptide that gives...Ch. 26.SE - Show the steps involved in a synthesis of...Ch. 26.SE - Prob. 45APCh. 26.SE - Prob. 46APCh. 26.SE - Prob. 47APCh. 26.SE - Which of the following amino acids are more likely...Ch. 26.SE - Leuprolide is a synthetic nonapeptide used to...Ch. 26.SE - The -helical parts of myoglobin and other proteins...Ch. 26.SE - Prob. 51APCh. 26.SE - Cytochrome c is an enzyme found in the cells of...Ch. 26.SE - Prob. 53APCh. 26.SE - Prob. 54APCh. 26.SE - Prob. 55APCh. 26.SE - What is the structure of a nonapeptide that gives...Ch. 26.SE - Oxytocin, a nonapeptide hormone secreted by the...Ch. 26.SE - Aspartame, a nonnutritive sweetener marketed under...Ch. 26.SE - Prob. 59APCh. 26.SE - Prob. 60APCh. 26.SE - Prob. 61APCh. 26.SE - Prob. 62AP
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- X The fundamental difference given in the 10 amino acids found in human proteins is given by the R group: True falsearrow_forwardPhenolphthalein has a pKa of 9.7. It is colorless in its acid form and pink in its basic form. For pH=2.2, calculate [In−]/[HIn]. For pH= 4.8, calculate [In−]/[HIn]. For pH= 7.7, calculate [In−]/[HIn]. For pH= 11.4, calculate [In−]/[HIn].arrow_forward(Q25) A buffer solution is prepared by adding 0.780 moles of formic acid and 0.760 moles of sodium formate. What will the solution pH be if 0.272 moles of sodium hydroxide (NaOH) is added to the buffer solution? The Ką of formic acid is 1.8 x 104.arrow_forward
- 4. For the Amino Acid you have been assigned, at the pH values provided, draw the structure(s) at each of the specified pH values. serine and pH = 0, 7, and 9 5. What is the overall charge for each of the structures you drew?arrow_forwardConsider an amino acid with the following pKa values: pKa1 = 2.71 and pKa2 = 9.31 At what pH value in aqueous solution would this amino acid (its predominant form) exist as an anion?arrow_forwardWhich amino acid has the greatest amount of negative charge at pH = 6.20?arrow_forward
- The protein neuroglobin has a heme group associated with it. It is an example of a Ο Ο Ο Ο Ο Ο lipoprotein nucleoprotein glycoprotein phosphoprotein O metalloprotein Ⓒhemoproteinarrow_forwardAll amino acids have two ionizable functional groups: an α‑amino group (average p?a of 9.4) and an α‑carboxylic acid group (average p?a of 2.2). Aspartic acid has an ionizable side chain (R group) with a p?a of about 3.8. One of the possible ionization states of aspartic acid is shown in the image. The protonated form of the R group of aspartic acid is shown in the structure. The ratio of the protonated form to the charged (deprotonated) form depends on the p?a of the R group and the pH of the solution. Select all the pH values at which the charged form of the R group would predominate.arrow_forwardNet Charge on an Amino Group.The amino acid glycine has hydrogen as its side-chain (R) group. Values of pKca= 2:36 and pKaa=9:56 have been previously reported for glycine. Superscripts c, a, and s refer to a-carboxylic acid, α-amino base, and side chain, respectively. Using these values, determine the net charge on the a-amino group of glycine at a physiologic pH of 7.2 and a pH of 3 [70].arrow_forward
- Aspartate has three ionizable groups with pKa values of 1.88, 9.60, and 3.65. What is the average net charge of aspartate at pH 3.65?arrow_forwardWhich R group would most likely be found in a hydrophobic area of the tertiary structure of a globular protein? * A. -CH3 В. -СH,ОН C. -CH,COO- D. -SH Е. -СH, CONH,arrow_forwardDraw the lewis structures of the following: alanine, asparagine, cysteine, glutamine, glycine, isoleucine, leucine, methionine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine, and valine. At a pH of 7.4. (May you check if those are the correct amino acid found in living cells)arrow_forward
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