FUND.OF GEN CHEM CHAP 1-13 W/ACCESS
16th Edition
ISBN: 9781323406038
Author: McMurry
Publisher: PEARSON C
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Textbook Question
Chapter 23, Problem 23.31AP
Are the carbon–carbon double bonds in naturally occurring fatty acids primarily cis or trans?
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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
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…
At 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 9460
Chapter 23 Solutions
FUND.OF GEN CHEM CHAP 1-13 W/ACCESS
Ch. 23.1 - Use Figure 23.1 to identify the family of lipids...Ch. 23.2 - Prob. 23.2PCh. 23.2 - Prob. 23.3PCh. 23.2 - Prob. 23.4KCPCh. 23.3 - Prob. 23.1CIAPCh. 23.3 - Prob. 23.2CIAPCh. 23.3 - Prob. 23.3CIAPCh. 23.3 - Prob. 23.5PCh. 23.3 - Prob. 23.6PCh. 23.3 - Prob. 23.7KCP
Ch. 23.4 - Prob. 23.8PCh. 23.4 - Prob. 23.9PCh. 23.4 - Prob. 23.10PCh. 23.4 - Prob. 23.11PCh. 23.5 - Prob. 23.12PCh. 23.5 - Draw the structure of the sphingomyelin that...Ch. 23.5 - Draw the structure of the glycerophospholipid that...Ch. 23.5 - Prob. 23.16PCh. 23.7 - Prob. 23.17KCPCh. 23.7 - Prob. 23.4CIAPCh. 23.7 - Prob. 23.6CIAPCh. 23.7 - Prob. 23.7CIAPCh. 23.7 - Prob. 23.8CIAPCh. 23.7 - Prob. 23.18PCh. 23.7 - Prob. 23.19PCh. 23.7 - Prob. 23.20KCPCh. 23 - The fatty acid composition of three...Ch. 23 - Prob. 23.23UKCCh. 23 - According to the fluid-mosaic model (Figure 23.7),...Ch. 23 - Dipalmitoylphosphatidylcholine (DPPC) is a...Ch. 23 - Prob. 23.26APCh. 23 - Prob. 23.27APCh. 23 - Prob. 23.28APCh. 23 - Prob. 23.29APCh. 23 - Differentiate between saturated, monounsaturated,...Ch. 23 - Are the carboncarbon double bonds in naturally...Ch. 23 - Prob. 23.32APCh. 23 - Prob. 23.33APCh. 23 - Which of these fatty acids has the lower melting...Ch. 23 - Which of these fatty acids has the higher melting...Ch. 23 - Prob. 23.36APCh. 23 - Prob. 23.37APCh. 23 - Prob. 23.38APCh. 23 - Prob. 23.39APCh. 23 - What function does a wax serve in a plant or...Ch. 23 - Prob. 23.41APCh. 23 - Prob. 23.42APCh. 23 - What kind of lipid is spermacetia fat, a wax, or a...Ch. 23 - Prob. 23.44APCh. 23 - Prob. 23.45APCh. 23 - Prob. 23.46APCh. 23 - Prob. 23.47APCh. 23 - Prob. 23.48APCh. 23 - Prob. 23.50APCh. 23 - Prob. 23.52APCh. 23 - Prob. 23.53APCh. 23 - Describe the difference between a triacylglycerol...Ch. 23 - Why are glycerophospholipids, rather than...Ch. 23 - Prob. 23.56APCh. 23 - Prob. 23.57APCh. 23 - Why are glycerophospholipids more soluble in water...Ch. 23 - Prob. 23.59APCh. 23 - Prob. 23.60APCh. 23 - Prob. 23.61APCh. 23 - Draw the structure of a glycerophospholipid that...Ch. 23 - Prob. 23.63APCh. 23 - What is a major function of cholesterol in your...Ch. 23 - Prob. 23.65APCh. 23 - Prob. 23.66APCh. 23 - Prob. 23.67APCh. 23 - Explain how a micelle differs from a membrane...Ch. 23 - Prob. 23.69APCh. 23 - Prob. 23.70APCh. 23 - Prob. 23.71APCh. 23 - Prob. 23.72APCh. 23 - Prob. 23.73APCh. 23 - Prob. 23.74APCh. 23 - Prob. 23.75APCh. 23 - Draw the structure of a triacylglycerol made from...Ch. 23 - Prob. 23.79CPCh. 23 - Prob. 23.80CPCh. 23 - Explain why cholesterol is not saponifiable.Ch. 23 - Draw cholesterol acetate. Is this molecule...Ch. 23 - Prob. 23.83CPCh. 23 - Prob. 23.84CPCh. 23 - Prob. 23.85CPCh. 23 - Prob. 23.86CPCh. 23 - Prob. 23.88GP
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