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′
What is the charge of the Peptide DMQK at pH=7 ?
A) -2
B) 0
C) -1
D) +2
4) Based on the following, which is true regarding the acid/base properties of guanine? pk = 2.4 palindromic pka = 9.4 NH NH NH NH H+ 10A) at physiological pH, guanine will be positively charged B) at physiological pH, guanine will be negatively charged C) at physiological pH, guanine will be neutral D) at physiological pH, guanine will be a very effective buffer against base E) at physiological pH, guanine will be a very effective buffer against acid NH₂ 4)
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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- 22-82 (Chemical Connections 22H) How does the fiberscope help to heal bleeding ulcers?arrow_forward22-24 Draw the most predominant form of histidine at its isoelectric point.arrow_forwardDraw the amino acids and peptide fragments formed when the decapeptide A–P–F–L–K–W–S–G–R–G is treated with each reagent or enzyme: (a) chymotrypsin; 8 pt helvetica roman (b) trypsin; (c) carboxypeptidase; (d) C6H5N = C = S.arrow_forward
- Given the following peptide RISAGDLEVK, Determine the formal charge of peptide a. pH=0.5 b. pH=7 c. pH=14 d. pH = pI (isoelectric point)arrow_forward1. Type of bond a. H-bond b. Electrostatic interaction c. Hydrophobic bond d. Disulfide bond e. Peptide bond 2. Level of protein structure a. primary b. secondary c. tertiary d. quaternary 3. Method/s of denaturation. choose all that applies a. Heating to 100 degrees Celsius b. Addition of nitric acid c. Reaching Isoelectric point d. Addition of mercuric chloride e. Addition of sulphosalicylic acid f. Addition of alcohol g. Addition of ammonium sulfatearrow_forward(a) What products are formed when each peptide is treated with trypsin? (b) What products are formed when each peptide is treated with chymotrypsin? [1] Gly–Ala–Phe–Leu–Lys–Ala [2] Phe–Tyr–Gly–Cys–Arg–Ser [3] Thr–Pro–Lys–Glu–His–Gly–Phe–Cys–Trp–Val–Val–Phearrow_forward
- 22-33 Which of the three functional groups on histidine is the most unique?arrow_forwardFollowing is the primary structure of glucagon, a polypeptide hormone of 29 amino acids. Glucagon is produced in the -cells of the pancreas and helps maintain blood glucose levels in a normal concentration range. Which peptide bonds are hydrolyzed when this polypeptide is treated with each reagent? (a) Phenyl isothiocyanate (b) Chymotrypsin (c) Trypsin (d) BrCNarrow_forward
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