Concept explainers
(a)
Interpretation: The validation about the given amino acid being a D-amino acid or an L-amino acid has to be answered.
Concept introduction: If
(b)
Interpretation: The validation about the given amino acid being a polar amino acid or a nonpolar amino acid has to be answered.
Concept introduction: The amino acid that has one
The amino acid that has one amine group, one carboxyl group and polar side chain is called polar amino acid.
(c)
Interpretation: The validation about the given amino acid being a standard or a nonstandard amino acid has to be answered.
Concept introduction: The amino acids that are found in proteins are called standard amino acids. There are 20 standard amino acids.
(d)
Interpretation: The validation about the given amino acid being an essential amino acid or a non-essential amino acid has to be answered.
Concept introduction: The standard amino acids that are required for the protein synthesis are called essential amino acids. The human body cannot synthesise these standard amino acids in sufficient amounts and should be included in the diet.
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Organic And Biological Chemistry
- At room temperature, amino acids are solids with relatively high decomposition points. Explain why.arrow_forwardWhat characteristics indicate that amino acids exist as zwitterions?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_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_forwardTo which family of mirror-image isomers do nearly all naturally occurring amino acids belong?arrow_forwardWhich is NOT a characteristic of proteins? a. They contain genetic information. b. They can act as hormones. c. They can catalyze chemical reactions. d. They act in cell membrane trafficking.arrow_forward
- Consider 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_forwardAnswer the following questions about the amino acid whose Fischer projection formula is a. Is it a D-amino acid or an L-amino acid? b. Is it a nonpolar or polar amino acid? c. Is it an essential or nonessential amino acid? d. Is it a standard or nonstandard amino acid?arrow_forwardAs the lipid content of a plasma lipoprotein increases, does its density increase or decrease?arrow_forward
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