Concept explainers
(a)
Interpretation: The net charge on valine in a low-
Concept introduction: In the solid state and also in solution,
(b)
Interpretation: The net charge on lysine in a low-
Concept introduction: In the solid state and also in solution,
(c)
Interpretation: The net charge on aspartic acid in a low-
Concept introduction: In the solid state and also in solution,
(d)
Interpretation: The net charge on serine in a low-
Concept introduction: In the solid state and also in solution,
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Organic And Biological Chemistry
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- In a low-pH aqueous solution, indicate whether each of the following amino acids has (1) a net positive charge of 2+, (2) a net positive charge of 1+, (3) a net charge of zero, (4) a net negative charge of 1, or (5) a net negative charge of 2. a. Valine b. Lysine c. Aspartic acid d. Serinearrow_forwardWhich of the following describes the primary structure of proteins? a. The collective shape assumed by all of the chains in a protein containing multiple chains. b. The folding of an individual protein molecule. c. The regular repeated shape of the protein molecules backbone. d. The sequence of amino acids bonded together by peptide bonds.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_forwardWhich of the following are true concerning the chemical bond that forms between the carboxyl (RCOOH) group of one amino acid and the amino (RCNH2) group of another? a.The bond is called a peptide bond. b.It is formed by inserting a water molecule between them. c.It is formed by a dehydration reaction. d.A polypeptide has more of these bonds than a protein.arrow_forwardFor 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_forward
- Do the amino acid sequences: valine-asparagine and asparagine-valine represent the same compound? Explain.arrow_forwardWhat 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_forwardWhat special role does the amino acid cysteine have in the peptides vasopressin and oxytocin?arrow_forward
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