FUND.OF GEN CHEM CHAP 1-13 W/ACCESS
16th Edition
ISBN: 9781323406038
Author: McMurry
Publisher: PEARSON C
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Chapter 16, Problem 16.61GP
Lemon juice, which contains citric acid, is traditionally recommended for removing the odor associated with cleaning fish. What
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The titration curve of alanine shows the ionization of two functional groups with pK values of 2.34 and 9.69, corresponding to
the ionization of the carboxyl and the protonated amino groups, respectively. The titration of di-, tri-, and larger oligopeptides of
alanine also shows the ionization of only two functional groups, although the experimental pK values are different. The table
summarizes the trend in pK values.
Amino acid or peptide
Ala
Ala-Ala
pKj
pk₂
2.34
9.69
3.12
8.30
Ala-Ala-Ala
3.39
8.03
Ala-(Ala)-Ala, n ≥ 4
3.42
7.94
Modify the molecules to show the oligopeptide Ala-Ala-Ala. You can modify the molecules by moving, adding,
deleting, or changing atoms, bonds, or charges.
C
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c
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H с N 0
S
Cl
H
H
| | ||
H CH3
H
CH,
H CH₂
Complete the statements about the the pK, values of the Ala-Ala-Ala oligopeptide.
The pK₁ value of 3.39 is associated with the
-COO group of Ala-Ala-Ala.
The pK2 value of 8.03 is associated with the -NH
group of Ala-Ala-Ala.
Erase
Q2 Q…
Facts from the bacterium
mals and to dept kan apa
in a peptide with antidic properties. This peptide
complex with
the call membrance of other hacterial species, leading in bacterial death
The structure of the peptide has been determined from
(a) Cmplete acid hydes of the peptide, followed by amino acid analys, yielded quiar anunt of Lan, Om, Pfx, Prxa,
and Wall Cmtiti, an amino acid od prosentin pockets but present in some peptides. Com has the tracture
H
*H,N-CH-CH-CH, -C- COO
(b) The weight of the peptide in approximately 1,200 Th
(c) The peptide failed to undergo hydrolysis when treated with the
Hydrolysis of the carbonyl-terminal residue of a polypeptide une
"NH,
the
year. This call
there Pro or the police does not contain a froz
(d) Treatment of the peptide with 1-haw-2,4-dicherer (11N1), followed by complete hydrolysis and
ched only from and the derivative
NO,
Н
ON
NHCHI
CH, CH, C
coo
+NH,
(Hint: The 2,4-diphenyl derivative involves the amino group of a side chain rather than the…
Electrophoresis
Macmillan Learning
Chymotrypsin is a protease with a molecular mass of 25.6 kDa. The figure shows a stained SDS polyacrylamide gel with a
single band in lane I and three bands of lower molecular weight in lane 2. Lane I contains a preparation of chymotrypsin and
lane 2 contains chymotrypsin pre-treated with performic acid.
1
2
Why does performic acid treatment of chymotrypsin generate three bands in lane 2?
°
Chymotrypsin self-digests on the carboxyl-terminal side of phenylalanine, tryptophan, or tyrosine residues.
The three peptides are impurities in the original chymotrypsin sample.
Performic acid cleaves proteins on the carboxyl-terminal side of lysine and arginine residues.
Performic acid cleaves the disulfide bonds holding together the three subunits of chymotrypsin.
Correct Answer
Chapter 16 Solutions
FUND.OF GEN CHEM CHAP 1-13 W/ACCESS
Ch. 16.2 - Identify the following compounds as primary,...Ch. 16.2 - Prob. 16.2PCh. 16.2 - Prob. 16.3PCh. 16.2 - Prob. 16.4PCh. 16.2 - Prob. 16.5KCPCh. 16.2 - Prob. 16.6KCPCh. 16.3 - Arrange the following compounds in order of...Ch. 16.3 - Draw the structures of (a) ethylamine and (b)...Ch. 16.4 - Provide compounds that fit the following...Ch. 16.4 - Prob. 16.10P
Ch. 16.4 - Prob. 16.11PCh. 16.5 - Write an equation for the acid-base equilibrium...Ch. 16.5 - Prob. 16.13PCh. 16.5 - Prob. 16.14PCh. 16.5 - Prob. 16.15PCh. 16.5 - Prob. 16.16PCh. 16.6 - Prob. 16.17PCh. 16.6 - Prob. 16.18PCh. 16.6 - Prob. 16.19PCh. 16.6 - Prob. 16.20PCh. 16.6 - Prob. 16.21PCh. 16.6 - Prob. 16.22PCh. 16.7 - Prob. 16.1CIAPCh. 16.7 - Prob. 16.2CIAPCh. 16.7 - Prob. 16.3CIAPCh. 16 - (a) For the compound above, identify each nitrogen...Ch. 16 - The structure of the amino acid lysine (in its...Ch. 16 - Prob. 16.25UKCCh. 16 - Prob. 16.26UKCCh. 16 - Prob. 16.27UKCCh. 16 - Complete the following equations: (a) (b)...Ch. 16 - Prob. 16.29APCh. 16 - Draw the structures corresponding to the following...Ch. 16 - Name the following amines, and classify them as...Ch. 16 - Name the following amines, and identify them as...Ch. 16 - Prob. 16.33APCh. 16 - Which is a stronger base, diethyl ether or...Ch. 16 - Prob. 16.35APCh. 16 - Prob. 16.36APCh. 16 - The compound lidocaine is used medically as a...Ch. 16 - Prob. 16.38APCh. 16 - Draw the structures of the ammonium ions formed...Ch. 16 - Prob. 16.40APCh. 16 - Prob. 16.41APCh. 16 - Prob. 16.42APCh. 16 - Prob. 16.43APCh. 16 - Prob. 16.44APCh. 16 - Prob. 16.45CPCh. 16 - Prob. 16.46CPCh. 16 - Prob. 16.47CPCh. 16 - Prob. 16.48CPCh. 16 - How do amines differ from analogous alcohols in...Ch. 16 - Name at least two undesirable characteristics are...Ch. 16 - Prob. 16.52CPCh. 16 - Complete the following equations (Hint: Answers...Ch. 16 - Prob. 16.54CPCh. 16 - Prob. 16.55CPCh. 16 - Why is cyclohexylamine not considered to be a...Ch. 16 - Prob. 16.57CPCh. 16 - Prob. 16.58GPCh. 16 - 1-Propylamine, 1-propanol, acetic acid, and butane...Ch. 16 - Prob. 16.60GPCh. 16 - Lemon juice, which contains citric acid, is...
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- Extracts from the bacterium Bacillus brevis contain a peptide with antibiotic properties. This peptide forms complexes with metal ions and seems to disrupt ion transport across the cell membranes of other bacterial species, leading to bacterial death. The structure of the peptide has been determined from a series of observations. (a) Complete acid hydrolysis of the peptide, followed by amino acid analysis, yielded equimolar amounts of Leu, Orn, Phe, Pro, and Val. Orn is ornithine, an amino acid not present in proteins but present in some peptides. Orn has the structure H 'H,N-CH, - CH2 CH2 CH2 - C - COO- NH, (b) The molecular weight of the peptide is approximately 1,200 Da. (c) The peptide failed to undergo hydrolysis when treated with the enzyme carboxypeptidase. This enzyme catalyzes the hydrolysis of the carboxyl-terminal residue of a polypeptide unless the residue is Pro or the peptide does not contain a free carboxyl group. (d) Treatment of the intact peptide with…arrow_forwardAt a pH equal to the isoelectric point (pl) of alanine, the net charge of alanine is zero. Two structures can be drawn that have a net charge of zero, but the predominant form of alanine at its pl is zwitterionic. CH3 H,N CH3 ** H¸N-C H Zwitterionic H Uncharged OH Select statements that explain why alanine is predominantly zwitterionic at its pl. pk of alanine's amino group is more than its pl. pk of alanine's carboxyl group is more than its pl. PK of alanine's carboxyl group is less than its pl. pk of alanine's amino group is less than its pl. Correct Answer What fraction of alanine is in the completely uncharged form at its pl? 1 in 2.2 × 107 1 in 1.6 × 10² 1 in 4680 1 in 9460arrow_forwardHow does a voltage-gated sodium channel work? Specifically, how and why does a change in voltage trigger their opening? Please be detailedarrow_forward
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- Calculate the standard change in Gibbs free energy, AGrxn, for the given reaction at 25.0 °C. Consult the table of thermodynamic properties for standard Gibbs free energy of formation values. NH,Cl(s) →NH; (aq) + C1 (aq) AGrxn -7.67 Correct Answer Determine the concentration of NH+ (aq) if the change in Gibbs free energy, AGrxn, for the reaction is -9.27 kJ/mol. 6.49 [NH+] Incorrect Answer kJ/mol Marrow_forwardWhat are some topics of interest that neurotoxicologists study? For example, toxin-induced seizures, brain death, and such along those lines?arrow_forwardCould you help me with the explanation of the answer to exercise 15, chapter 1 of Lehinger Question Nombramiento de estereoisómeros con dos carbonos quirales utilizando el sistema RS(R,R)El isómero del metilfenidato (Ritalin) se utiliza para tratar el trastorno por déficit de atención con hiperactividad (TDAH).(S,S)El isómero es un antidepresivo. Identifique los dos carbonos quirales en la siguiente estructura. ¿Es este el(R,R)o el(S,S)¿isómero? Dibuja el otro isómero. Nombramiento de estereoisómeros con dos carbonos quirales utilizando el sistema RS(R,R)El isómero del metilfenidato (Ritalin) se utiliza para tratar el trastorno por déficit de atención con hiperactividad (TDAH).(S,S)El isómero es un antidepresivo.arrow_forward
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