Organic Chemistry (8th Edition)
8th Edition
ISBN: 9780134042282
Author: Paula Yurkanis Bruice
Publisher: PEARSON
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Textbook Question
Chapter 26, Problem 26P
The first amino acid incorporated into a polypeptide chain durings its biosynthesis in prokaryotes is N-formylmethionine. Explain the puepose of the formyl group. (Hint: The ribosome has a binding site for the growing peptide chain and a binding site for the incoming amino acid.)
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Chapter 26 Solutions
Organic Chemistry (8th Edition)
Ch. 26.1 - In acidic solutions, nucleosides are hydrolyzed to...Ch. 26.1 - Draw the structure for each of the following: a....Ch. 26.3 - Indicate whether each functional group of the five...Ch. 26.3 - Prob. 4PCh. 26.3 - If one of the strands of DNA has the following...Ch. 26.4 - The 2',3-cyclic phosphodiester that is formed...Ch. 26.5 - Using a dark line for the original parental DNA...Ch. 26.7 - Why do both thymine and uracil specify the...Ch. 26.9 - If methionine is always the first amino acid...Ch. 26.9 - Four Cs occur in a row in the segment of mRNA...
Ch. 26.9 - UAA is a stop codon. Why does the UAA sequence in...Ch. 26.9 - Prob. 12PCh. 26.9 - Write the sequences of bases in the sense strand...Ch. 26.9 - List the possible codons on mRNA that speciy each...Ch. 26.10 - Adenine can be deaminated to hypoxanthine, and...Ch. 26.10 - Explain why thymine cannot be deaminated.Ch. 26.12 - Which of the following base sequences is most...Ch. 26 - What nonapeptide is coded for by the following...Ch. 26 - What is the sequence of bases in the template...Ch. 26 - Prob. 20PCh. 26 - A segment of DNA has 18 base pairs. It has 7...Ch. 26 - Name the following:Ch. 26 - Prob. 23PCh. 26 - Propose a mechanism for the following reaction:Ch. 26 - The first amino acid incorporated into a...Ch. 26 - Match the codon with the anticodon:Ch. 26 - a. Using the single-letter abbreviations for the...Ch. 26 - Which of the following pairs of dinucleotides are...Ch. 26 - Human immunodeficiency virus (HIV) is the...Ch. 26 - If a mRNA contained only U and G in random...Ch. 26 - Why is the codon a triplet rather than a doublet...Ch. 26 - RNAase, the enzyme that catalyzes the hydrolysis...Ch. 26 - The amino acid sequences of peptide fragments...Ch. 26 - Which cytosine in the following sense strand of...Ch. 26 - Prob. 36PCh. 26 - Sodium nitrite, a common food preservative (page...Ch. 26 - Why does DNA not unravel completely before...Ch. 26 - Staphylococcus nuclease is an enzyme that...
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- With the help of Table 20-1, determine the name and the three-letter abbreviation for the name for each of the standard amino acids in Problem 20-9.arrow_forward22-42 (a) How many atoms of the peptide bond lie in the same plane? (b) Which atoms are they?arrow_forwardComplete degradation of a protein into individual amino acids involves choose all that are correct: a. Removal of a water molecule from between two amino acids b. Addition of a water molecule between two amino acids c. A hydrolysis reaction d. The breaking of peptide linkagearrow_forward
- 22-48 How many amino acid residues in the A chain of insulin are the same in insulin from humans, cattle (bovine), hogs, and sheep?arrow_forwardDrawing Peptide Structures Draw the tripeptide that would result from cysteine attaching to the previous dipeptide on the acidic side.arrow_forwardSuppose that 30% of the nucleotides in a DNA molecule are deoxyguanosine 5'- monophosphate, and that during DNA replication the percentage amounts of available nucleotide bases are 20% A, 20% C. 30% G. and 30% T. Which base would be depleted first in the replication process?arrow_forward
- On complete hydrolysis, a polypeptide gives two alanine, one leucine, one methionine, one phenylalanine, and one valine residue. Partial hydrolysis gives the following fragments: Ala-Phe, Leu-Met, Val-Ala, Phe-Leu. It is known that the first amino acid in the sequence is valine and the last one is methionine. What is the complete sequence of amino acids?arrow_forwardSuppose 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_forwardWhat functional groups are present in all -amino acids?arrow_forward
- Once cooked, egg whites remain in a solid form. However, egg whites that are beaten to form meringue will partially change back to a jellylike form if allowed to stand for a while. Explain these behaviors using the concept of reversible protein denaturation.arrow_forwardThe -chain of hemoglobin is a protein that contains 146 amino acids residues. What minimum number of nucleotides must be present in a strand of mRNA that is coded for this protein?arrow_forwardGive one example of a conjugated protein that contains the following prosthetic group: a.iron b.lipid c.phosphate group d.carbohydrate e.hemearrow_forward
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