Essential Organic Chemistry (3rd Edition)
3rd Edition
ISBN: 9780321937711
Author: Paula Yurkanis Bruice
Publisher: PEARSON
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Textbook Question
Chapter 21.9, Problem 6P
If methionine is always the first amino acid incorporated into an oligopeptide, what oligopeptide is coded for by the following stretch of mRNA?
5’—G—C—A—U—G—G—A—C—C—C—C—G—U—U—A—U—U—A—A—A—C—A—C—3’
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If methionine is always the first amino acid incorporated into an oligopeptide, what oligopeptide is coded for by the following stretch of mRNA? 5′-G-C-A-U-G-G-A-C-C-C-C-G-U-U-A-U-U-A-A-A-C-A-C-3′
Researchers analysed a glycopeptide (a peptide carrying one or several oligosaccharide
groups) and determined both the sequence of the peptide and the sequence of the sugar molecule. The
latter was identified as a diholoside coupled to the peptide by an osidic bond. The systematic name
of this sugar is:
B-D-glucopyranosyl-(1→4)-ß-D-galactopyranose.
: Represent the chemical formula of this diholoside in a way that all oses are
Question 1
represented according to the Haworth convention. Apart from the furane and/or pyrane cycles all
atoms of this molecule must be given.
The amino acid histidine has ionizable groups with pK₁ values of 1.8, 6.0, and 9.2, as shown.
COOH
H¸Ñ—CH
CH₂ H
2
CH
pH =
COO™
H¸Ñ—CH
1.8
pk₁
CH₂ H
lonizable -COOH = -COO-
group
CH
COO™
H₂N-CH
6.0
pK₂2
CH₂ H
-HisH -His
N
CH
COO™
H₂N-CH
9.2
pk
CH₂ H
2
—NH — —NH,
CH
A biochemist makes up 95 mL of a 0.13 M solution of histidine at a pH of 5.3. She then adds 60 mL of 0.10 M HCl. What is the
pH of the resulting solution?
Chapter 21 Solutions
Essential Organic Chemistry (3rd Edition)
Ch. 21.1 - Draw the structure for each of the following: a....Ch. 21.3 - If one of the strands of DNA has the following...Ch. 21.4 - The 2,3-cyclic phosphodiester that is formed...Ch. 21.5 - Using a dark line for the original parental DNA...Ch. 21.7 - Why do both thymine and uracil specify the...Ch. 21.9 - If methionine is always the first amino acid...Ch. 21.9 - Four Cs occur in a row in the segment of mRNA...Ch. 21.9 - UAA is a stop codon. Why does the UAA sequence in...Ch. 21.9 - A change in which base of a codon would be least...Ch. 21.9 - Write the sequences of bases in the sense strand...
Ch. 21.9 - List the possible codons on mRNA that specify each...Ch. 21.10 - Adenine can be deaminated to hypoxanthine, and...Ch. 21.10 - Explain why thymine cannot be deaminated.Ch. 21.12 - Which of the following base sequences would most...Ch. 21 - Draw structures for the following: a....Ch. 21 - What nonapeptide is coded for by the following...Ch. 21 - What is the sequence of bases in the template...Ch. 21 - What is the sequence of bases in the sense strand...Ch. 21 - What would be the C-terminal amino acid if the...Ch. 21 - What would be the base sequence of the segment of...Ch. 21 - Propose a mechanism for the following reaction:Ch. 21 - A segment of DNA has 18 base pairs. It has 7...Ch. 21 - Match the codon with the anticodon: Codon: AAA GCA...Ch. 21 - Using the single-letter abbreviations for the...Ch. 21 - Indicate whether each functional group of the five...Ch. 21 - Using the A and D designations in Problem 25,...Ch. 21 - Which of the following pairs of dinucleotides are...Ch. 21 - If an mRNA contained only U and G in random...Ch. 21 - Why is the codon a triplet rather than a doublet...Ch. 21 - Human immunodeficiency virus (HIV) is the...Ch. 21 - The amino acid sequences of peptide fragments...Ch. 21 - Which cytosine in the following sense strand of...Ch. 21 - Prob. 33PCh. 21 - Why does DNA not unravel completely before...Ch. 21 - The first amino acid incorporated into a...
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- 22-61 Polyglutamic acid (a polypeptide chain made only of glutamic acid residues) has an a-helix conformation below pH 6.0 and a random-coil conformation above pH 6.0. What is the reason for this conformational change?arrow_forward22-42 (a) How many atoms of the peptide bond lie in the same plane? (b) Which atoms are they?arrow_forwardWhat sequence of bases on one strand of DNA is complementary to the following sequence on another strand? (5') GGCTAATCCGT (3')arrow_forward
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