Concept explainers
(a)
Interpretation:
The position of ammonia that might have been incorporated in the original peptide is to be explained.
Concept introduction:
Amides are formed when
(b)
Interpretation:
The
Concept introduction:
Amides are formed when amines and acids are condensed. It is accompanied by the loss of water molecule. The
(c)
Interpretation:
The given findings are to be explained.
Concept introduction:
Amides are formed when amines and acids are condensed. It is accompanied by the loss of water molecule. The
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Organic Chemistry (9th Edition)
- 22-42 (a) How many atoms of the peptide bond lie in the same plane? (b) Which atoms are they?arrow_forwardDrawing Peptide Structures Draw the tripeptide that would result from cysteine attaching to the previous dipeptide on the acidic side.arrow_forwardOn 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_forward
- What special role does the amino acid cysteine have in the peptides vasopressin and oxytocin?arrow_forwardWhat are the two alternating structure units present in the backbone of a peptide?arrow_forwardGlutathione (G-SH), one of the most common tripeptides in animals, plants, and bacteria, is a scavenger of oxidizing agents. In reacting with oxidizing agents, glutathione is converted to G-S-S-G. (a) Name the amino acids in this tripeptide. (b) What is unusual about the peptide bond formed by the N-terminal amino acid? (c) Write a balanced half-reaction for the reaction of two molecules of glutathione to form a disulfide bond. Is glutathione a biological oxidizing agent or a biological reducing agent? (d) Write a balanced equation for reaction of glutathione with molecular oxygen, O2 to form G-S-S-G and H2O. Is molecular oxygen oxidized or reduced in this process?arrow_forward
- At room temperature, amino acids are solids with relatively high decomposition points. Explain why.arrow_forwardUsing both three- and one-letter codes for amino acids, write the structures of all possible peptides containing the following amino acids: (a) Val, Ser, Leu (b) Ser, Leu2, Proarrow_forwardConsider the tripeptide leucylvalyltryptophan. a. Specify its structure using three-letter symbols for the amino acids. b. How many peptide bonds are present within the peptide? c. Which of the amino acid residues has the largest R group? d. Which of the amino acid residues, if any, has a basic side chain?arrow_forward
- Draw a segment of the backbone of a protein that is long enough for three peptide linkages to be present.arrow_forwardWhat is the major difference between a simple protein and a conjugated protein?arrow_forwardConsider the tripeptide tyrosylleucylisoleucine. a. Specify its structure using three-letter symbols for the amino acids. b. How many peptide bonds are present within the peptide? c. Which of the amino acid residues has the largest R group? d. Which of the amino acid residues, if any, has an acidic side chain?arrow_forward
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