Concept explainers
(a)
Interpretation:
The number of tripeptides obtained from amino acids valine, lysine and phenylalanine needs to be determined.
Concept Introduction:
Amino acids are organic compounds containing amino as well as carboxylic groups. The general structure of an amino acid is shown as follows:
Here, R group is different for different amino acids.
These amino acids are linked through peptide bonds and results in the formation of protein. Thus, amino acids are simple unit of a peptide chain.
(b)
Interpretation:
The structural formula of tripeptides and their name according to shorthand abbreviation of amino acids needs to be determined.
Concept Introduction:
Amino acids are organic compounds containing amino as well as carboxylic groups. The general structure of an amino acid is shown as follows:
Here, R group is different for different amino acids.
These amino acids are linked through peptide bonds and results in the formation of protein. Thus, amino acids are simple unit of a peptide chain.
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Chemistry: Principles and Reactions
- Using the single letter abbreviations A, V, and L, as given in Table 22-1, list the tripeptides formed if alanine, valine, and leucine are all mixed together and peptide bonds are allowed to form in all possible combinations.arrow_forward(a) How many tripeptides can be made from glycine, alanine, and leucine, using each amino acid only once per tripeptide? (b) Write the structural formulas of these tripeptides and name them in the shorthand abbreviation used for showing amino acid sequences.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
- Consider 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_forward22-47 How many different tetrapeptides can be made (a) if the peptides contain the residues of asparagine, proline, serine, and metbionine and (b) if all 20 amino acids can be used?arrow_forward22-49 Based on your knowledge of the chemical properties of amino acid side chains, suggest a substitution for leucine in the primary structure of a protein that would probably not change the character of the protein very much.arrow_forward
- For the tripeptide SerArgIle which amino acid residues a. are hydrophilic b. are hydrophobic c. possess polar neutral R groups d. participate in two amide linkagesarrow_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
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