Organic Chemistry
7th Edition
ISBN: 9780321803221
Author: Paula Y. Bruice
Publisher: Prentice Hall
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Textbook Question
Chapter 26, Problem 40P
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
Ch. 26.1 - In acidic solutions, nucleosides are hydrolyzed to...Ch. 26.1 - Draw the structure for each of the following: a....Ch. 26.2 - Prob. 3PCh. 26.3 - Indicate whether each functional group of the five...Ch. 26.3 - Prob. 5PCh. 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. 13PCh. 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 - Name the following:Ch. 26 - What nonapeptide is coded for by the following...Ch. 26 - What is the sequence of bases in the template...Ch. 26 - Prob. 22PCh. 26 - Prob. 23PCh. 26 - Prob. 24PCh. 26 - Propose a mechanism for the following reaction:Ch. 26 - A segment of DNA has 18 base pairs. It has 7...Ch. 26 - Match the codon with the anticodon:Ch. 26 - Prob. 28PCh. 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...Ch. 26 - The first amino acid incorporated into a...
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- 22-42 (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_forward22-48 How many amino acid residues in the A chain of insulin are the same in insulin from humans, cattle (bovine), hogs, and sheep?arrow_forward
- Drawing 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_forwardWhat are the two alternating structure units present in the backbone of a peptide?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_forward
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