Amino Acids and Peptides

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Questions and Answers

Which of the following is true about the structure of amino acids in proteins?

  • Amino acids in proteins have three-letter designations.
  • Amino acids in proteins have no specific designations.
  • Amino acids in proteins have both three-letter and one-letter designations. (correct)
  • Amino acids in proteins have one-letter designations.

What is the primary contribution of the R groups of protein amino acids to their chemical properties?

  • R groups determine the size of amino acids.
  • R groups determine the solubility of amino acids. (correct)
  • R groups determine the shape of amino acids.
  • R groups determine the pH of amino acids.

Which of the following is a key function of amino acids?

  • Amino acids regulate body temperature.
  • Amino acids provide energy for the body.
  • Amino acids aid in digestion.
  • Amino acids support muscle growth. (correct)

How can certain amino acids in plant seeds impact human health?

<p>Certain amino acids in plant seeds can cause allergies. (C)</p> Signup and view all the answers

What is the approximate pKa value of ionizable groups in free amino acids in aqueous solution?

<p>pKa value of 7 (B)</p> Signup and view all the answers

Which of the following is true about the primary structure of peptides?

<p>It refers to the unique sequence of amino acids in a protein. (D)</p> Signup and view all the answers

What is the change in pH that occurs following the addition of a given quantity of strong acid or alkali to an unbuffered aqueous solution of a polyfunctional amino acid?

<p>It cannot be calculated without additional information. (A)</p> Signup and view all the answers

What is the approximate pKa value of the ionizable groups of protein amino acids as free amino acids in aqueous solution?

<p>6-8 (B)</p> Signup and view all the answers

What are the three-letter and one-letter designations for the amino acid alanine?

<p>ALA, A (A)</p> Signup and view all the answers

What is the primary contribution of the R groups of protein amino acids to their chemical properties?

<p>They determine the charge of the amino acid. (A)</p> Signup and view all the answers

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