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Questions and Answers
Which of the following statements about amino acids is correct?
Which of the following statements about amino acids is correct?
- Amino acids always have a zero net charge.
- Amino acids can have a positive, negative, or zero net charge. (correct)
- Amino acids can only have a positive or negative net charge.
- Amino acids can only have a positive net charge.
What is the term used to describe an amino acid with an equal number of positively and negatively charged groups?
What is the term used to describe an amino acid with an equal number of positively and negatively charged groups?
- Neutral
- Isoelectric
- Zwitterion (correct)
- Polar
What is the isoelectric pH (pI) for the amino acid aspartic acid?
What is the isoelectric pH (pI) for the amino acid aspartic acid?
- pI = 9.2
- pI = 5.0
- pI = 7.4
- pI = 3.9 (correct)
Which of the following statements about the solubility of amino acids is correct?
Which of the following statements about the solubility of amino acids is correct?
What is the primary structural feature that determines the properties of amino acids?
What is the primary structural feature that determines the properties of amino acids?
What is the purpose of the non-α peptide bond in the structure of glutathione?
What is the purpose of the non-α peptide bond in the structure of glutathione?
What is the primary function of amino acids in the body?
What is the primary function of amino acids in the body?
What is the charge on an amino acid at its isoelectric point (pI)?
What is the charge on an amino acid at its isoelectric point (pI)?
Which of the following best describes the zwitterionic nature of amino acids?
Which of the following best describes the zwitterionic nature of amino acids?
Which type of amino acid has a non-polar, hydrophobic side chain?
Which type of amino acid has a non-polar, hydrophobic side chain?
What is the purpose of the R-group in amino acid structure?
What is the purpose of the R-group in amino acid structure?
Which of the following best describes the peptide bond in a polypeptide chain?
Which of the following best describes the peptide bond in a polypeptide chain?
What property of selenocysteine makes it a better nucleophile than cysteine at or below pH 7.4?
What property of selenocysteine makes it a better nucleophile than cysteine at or below pH 7.4?
Which of the following is an example of a nonprotein L-$\alpha$-amino acid?
Which of the following is an example of a nonprotein L-$\alpha$-amino acid?
What is the primary reason certain plant L-$\alpha$-amino acids can adversely impact human health?
What is the primary reason certain plant L-$\alpha$-amino acids can adversely impact human health?
What is the net charge of an amino acid at its isoelectric point?
What is the net charge of an amino acid at its isoelectric point?
Which of the following is a characteristic of the zwitterionic form of an amino acid?
Which of the following is a characteristic of the zwitterionic form of an amino acid?
What is the purpose of the resonance hybrids shown in Figure 3-4 for the R-groups of histidine and arginine?
What is the purpose of the resonance hybrids shown in Figure 3-4 for the R-groups of histidine and arginine?
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