BIOCHEMISTRY (LL)
9th Edition
ISBN: 9781337805100
Author: Campbell
Publisher: CENGAGE L
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Textbook Question
Chapter 13, Problem 52RE
RECALL What are the key differences between DNA microarrays and protein microarrays, and how they are used in research?
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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 13 Solutions
BIOCHEMISTRY (LL)
Ch. 13 - RECALL What advantages does fluorescent labeling...Ch. 13 - RECALL What methods are used to visualize...Ch. 13 - REFLECT AND APPLY When proteins are separated...Ch. 13 - RECALL How does the use of restriction...Ch. 13 - RECALL What is the importance of methylation in...Ch. 13 - RECALL Why do restriction endonucleases not...Ch. 13 - Prob. 7RECh. 13 - Prob. 8RECh. 13 - RECALL What do the following have in common? MOM;...Ch. 13 - RECALL Give three examples of DNA palindromes.
Ch. 13 - RECALL What are three differences between the...Ch. 13 - RECALL What are sticky ends? What is their...Ch. 13 - RECALL What would be an advantage of using HaeIII...Ch. 13 - RECALL Describe the cloning of DNA.Ch. 13 - RECALL What vectors can be used for cloning?Ch. 13 - RECALL Describe the method you would use to test...Ch. 13 - RECALL What is blue/white screening? What is the...Ch. 13 - Prob. 18RECh. 13 - Prob. 19RECh. 13 - Prob. 20RECh. 13 - Prob. 21RECh. 13 - Prob. 22RECh. 13 - Prob. 23RECh. 13 - REFLECT AND APPLY What are the requirements for an...Ch. 13 - Prob. 25RECh. 13 - Prob. 26RECh. 13 - REFLECT AND APPLY The genes for both the a- and...Ch. 13 - REFLECT AND APPLY Outline the methods you would...Ch. 13 - Prob. 29RECh. 13 - Prob. 30RECh. 13 - Prob. 31RECh. 13 - Prob. 32RECh. 13 - RECALL Why is temperature control so important in...Ch. 13 - RECALL Why is the use of temperature-stable DNA...Ch. 13 - RECALL What are the criteria for good primers in a...Ch. 13 - REFLECT AND APPLY What difficulties arise in the...Ch. 13 - REFLECT AND APPLY Each of the following pairs of...Ch. 13 - RECALL What is qPCR?Ch. 13 - Prob. 39RECh. 13 - REFLECT AND APPLY Suppose that you are a...Ch. 13 - REFLECT AND APPLY Why is DNA evidence more useful...Ch. 13 - REFLECT AND APPLY Give the DNA sequence for the...Ch. 13 - Prob. 43RECh. 13 - Prob. 44RECh. 13 - Prob. 45RECh. 13 - Prob. 46RECh. 13 - Prob. 47RECh. 13 - RECALL Has proteomic analysis been done on...Ch. 13 - Prob. 49RECh. 13 - Prob. 50RECh. 13 - Prob. 51RECh. 13 - RECALL What are the key differences between DNA...
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