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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List the possible codons on mRNA that specify each amino acid in Problem and the anticodon on the tRNA that carries that amino acid.
Which cytosine in the following sense strand of DNA could cause the most damage to the organism if it is deaminated?
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_forwardResearchers 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.arrow_forwardFf.231.arrow_forward
- 22-93 What charges are on aspartic acid at pH 2.0?arrow_forward22-89 What kind of noncovalent interaction occurs between the following amino acids? (a) Valine and isoleucine (b) Glutamic acid and lysine (c) Tyrosine and threonine (d) Alanine and alaninearrow_forward22-91 Which amino acid does not rotate the plane of polarized light?arrow_forward
- Suppose that 28% of the nucleotides in a DNA molecule are deoxythymidine 5'-monophosphate, and that during DNA replication the percentage amounts of available nucleotide bases art 22% A, 22% C, 28% G. and 28% T. Which base would be depleted first in the replication process?arrow_forwardIdentify the following antioxidant molecule. A. alpha tocopherol hydroquinone B.dehydroascorbic acid CH3 CH3 C. alpha tocopherol semi-quinone \ / D. ascorbic acid C = C E. alpha tocopherol quinone / \ : O – C C – O CH3 \\ // \ / C – C C – CH2–CH2–CH2–CH–CH2–CH2–CH2–CH–CH2–CH2–CH2–CH–CH3 / \ / l l l CH3 CH2– CH2…arrow_forwardPLEASE DRAW THIS AGAIN BUT TYPEWRITTEN. I WILL UPVOTEarrow_forward
- Answer the questions in the table below about this molecule:arrow_forwardThe amino acid histidine has ionizable groups with pKą values of 1.8, 6.0, and 9.2, as shown. H₂N-CH T COOH pH CH₂ H lonizable -COOH group = CH COO- H₂N-CH 1.8 pk₁ CH2 -COO- H -N CH -HisH+ COO- + H₂N-CH 6.0 pk₂ CH2 -His CH -NH COO- H₂N-CH 9.2 pk3 CH2 -N -NH₂ A biochemist makes up 80 mL of a 0.11 M solution of histidine at a pH of 5.1. She then adds 60 mL of 0.10 M HCl. What is the pH of the resulting solution? CHarrow_forwardGiven below is the structure of a peptide with the name seryllysylaspartate. What is the amino acid at the C-terminus (or C-terminal amino acid) of this peptide? OH | CH, O || + H₂N-C | H O lysine Z-: serine + ŃH₂ T CH₂ T O aspartate CH₂ T CH₂ CH, O || N -C | O lysylaspartate H H C CH, O || C-O C-N C 1 H Harrow_forward
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