Concept explainers
a.
To draw:
The structural formula for the given peptide Ala-Asn-Thr.
Introduction:
The condensation reaction between the N-terminal of one amino acid and carboxylic group of another amino acid leads to the formation of a peptide bond. According to the convention, N-terminal of amino acid in a peptide bond is written on the left hand side while the C-terminal of amino acids is written on the right hand side at the table.
b.
To draw:
The structural formula for the given peptide DS.
Introduction:
The condensation reaction between the N-terminal of one amino acid and carboxylic group of another amino acid leads to the formation of a peptide bond. According to the convention, N-terminal of amino acid in a peptide bond is written on the left hand side while the C-terminal of amino acids is written on the right hand side at the table.
c.
To draw:
The structural formula for the given peptide Val-Arg.
Introduction:
The condensation reaction between the N-terminal of one amino acid and carboxylic group of another amino acid leads to the formation of a peptide bond. According to the convention, N-terminal of amino acid in a peptide bond is written on the left hand side while the C-terminal of amino acids is written on the right hand side at the table.
d.
To draw:
The structural formula for the given peptide IYP.
Introduction:
The condensation reaction between the N-terminal of one amino acid and carboxylic group of another amino acid leads to the formation of a peptide bond. According to the convention, N-terminal of amino acid in a peptide bond is written on the left hand side while the C-terminal of amino acids is written on the right hand side at the table.
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GENERAL, ORGANIC, AND BIOLOGICAL CHEMIS
- How long is an a-helix that contains 74 amino acids? a. How long is a fully extended peptide chain that contains the same number of amino acids? (The distance between consecutive amino acids in a fully extended chain is 3.5 Å; the repeat distance of an a-helix is 5.4 Å.)arrow_forwardWhich of the following defines the primary structure of a protein? a) the geometric arrangement of the backbone atoms of a protein b) the geometric arrangement of the side chains of a protein c) tje sequence of the amino acids in a protein d) all of the above What determines the function of amino acids? a) their molecular weight b) their side chain c) both molecular weight and side chain d) neither molecular weight nor side chainarrow_forwardHi please help me Draw the following structure and answer the question. The peptide with the sequence GVPLH has antioxidant properties. 1.) Draw the chemical structure of this peptide at pH 7.arrow_forward
- What types of interactions can occur between the side chains of the following amino acids that would help maintain the tertiary structure of a protein? a. cysteine and cysteine b. glutamine and serine c. glutamic acid and lysine d. proline and leucinearrow_forwardIdentify the R group of the side chain in the following amino acids that results in the side-chain classification indicated in parentheses see Table 19.1: a. tyrosine neutral, polar b. glutamate acidic, polar c. methionine neutral, nonpolar d. histidine basic, polar e. cysteine neutral, polar f. valine neutral, nonpolararrow_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_forward
- Estimate the pI of each tripeptide in Problem 27.46. Draw a structural formula of these tripeptides. Mark each peptide bond, the N-terminal amino acid, and the C-terminal amino acid. (a) Phe-Val-Asn (b) Leu-Val-Glnarrow_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_forwardWhat are the two alternating structure units present in the backbone of a peptide?arrow_forward
- At room temperature, amino acids are solids with relatively high decomposition points. Explain why.arrow_forward22-30 (a) Use the three-letter abbreviations to write a representation of the following tripeptide: (b) Which amino acid is at the C-terminal end, and which is at the N-terminal end?arrow_forward
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