Organic Chemistry
9th Edition
ISBN: 9781305080485
Author: John E. McMurry
Publisher: Cengage Learning
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Chapter 26.SE, Problem 29AP
Except for cysteine, only S amino acids occur in proteins. Several R amino acids are also found in nature, however. (R)-Serine is found in earthworms, and (R)-alanine is found in insect larvae. Draw Fischer projections of (R)-serine and (R)-alanine. Are these d or l amino acids?
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Draw the stereoisomers of the following amino acids. Indicate pairs of enantiomers and pairs of diastereomers.
5.Indicate the amino acid as polar or nonpolar
OH
CH: 0
H₂N-C-C-OH
H
O
CH, 0
!!
H₂N-C-C-o
H
CH3 CH3
CH
CHO
11₂N-C-C-07
H
6) Acids and bases denature a protein by
disrupting
A) peptide bonds and ionic bonds.
B) amide bonds and alkene bonds.
C) hydrophobic interactions and peptide
bonds.
D) ionic bonds and hydrophobic interactions.
E) ionic bonds and hydrogen bonds.
5) Heat denatures a protein by disrupting
A) ionic bonds and peptide bonds.
B) hydrophobic bonds and hydrogen bonds.
C) peptide bonds and hydrophobic bonds.
D) disulfide bonds and peptide bonds.
E) hydrogen bonds and disulfide bonds.
7) Denaturation of a protein
A) changes the primary structure of a protein.
B) disrupts the secondary, tertiary, or
quaternary structure of a protein.
C) is always irreversible.
D) hydrolyzes peptide bonds.
E) can only occur in a protein with quaternary
structure.
8) Heavy metals denature proteins by
A) releasing amino acids.
B) disrupting hydrophobic interactions.
C) changing the pH of the…
The amino acid alanine has the condensed structural formula CH3CH(NH2)CO2H. Which Fischer projection
represents (R)-alanine?
NH2
А.
-CO2H
CH3
NH2
H3C-
ČO,H
C.
CO,H
H3C-
-NH2
H
- D.
CO,H
to
-NH2
CH3
B.
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Similar questions
- 5. Arg and Lys Asp and Lys Pro and Glu Among these amino acid combinations listed above, only the combination of Asp and Lys have side chains with groups that have the greatest ability to stabilize the tertiary structure of a protein. Explain in your own words and by drawing (1) why Asp and Lys side chain interaction stabilizes the tertiary structure of a protein, and (2) why the pairs of Arg and Lys & Pro and Glu cannot provide the stability to the protein structure.arrow_forwardDraw the two enantiomers for the amino acid leucine, H0OCCH(NH)CH,CH(CHa)2, and label each enantiomer as R or S. Only the S isomer exists in nature, and it has a bitter taste. Its enantiomer, however, is sweet.arrow_forwardB Identify the functional groups found in the side chair (the & group). Is the R-group. polar neutral polar changed, or non-polar & №t₂ CH₂ ANCH E-0- Aspamagine CH3 Ś CH₂ &#₂ O + HƠN CH Co Methionine HO HD Cf chts - c-E-0- threonne If these o acids represent L-amino acids, draw the general structure for a D-amino acid.arrow_forward
- Consider the amino acid molecule shown below in a Fischer representation. Which of the following correctly designates this molecule as either a D- or L-amino acid? Hint: you may need to switch two groups one or two times to get the molecule to look like the familiar Fischer D- and L- representations of the "reference compound" glyceraldehyde. Recall that -COOH (or HOOC-, depending on the orientation) represents a carboxylic acid functional group. Isopropyl H NH₂ -COOH The molecule is neither a D- nor an L-amino acid O The molecule is a L-amino acid O The molecule is a D-amino acidarrow_forwardWhat does the "alpha" indicate in "α-amino acid"? That the -COOH group is below the plane of the ring. That the amino group is the first group in the compound. That the alpha-carbon has a -NH2 attached. The the amino acid is the dominant form.arrow_forwardTrue or Falsearrow_forward
- answer all the questionsarrow_forwardA) Draw the structure of the peptide Methionylleucyltyrosylasparagine in the zwitterion form: Tyrosine: R=-CH₂- -OH Methionine: R=CH₂-CH₂-S-CH₂ Asparagine: R=-CH₂-C-NH₂ Leucine: R=-CH₂-CH-CH₂ B) Classify the following amino acids as polar, nonpolar, acidic or basic: Tyrosine: Leucine: CHSarrow_forwardThe structure of the artificial sweetener aspartame is shown below. What type of linkage is found in this compound? H. +H,N-CH-C-N-CH C-OCH, CH2 CH2 C3D0 Aspartame (Asp-Phe-OMe) O peptide bond O phosphoester linkage O ester linkage O glycosidic linkagearrow_forward
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