Protein Macromolecules Overview
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Questions and Answers

What is the main functional group found in amino acids?

  • Amino group (correct)
  • Hydrogen atom
  • R group
  • Carboxyl group

Which carbon is considered the chiral center in amino acids?

  • 2 (correct)
  • 3
  • 4
  • 1

What makes each amino acid unique from others?

  • An amino group
  • An R group (correct)
  • A hydrogen atom
  • A carboxyl group

What role does the α-carbon play in the structure of amino acids?

<p>It acts as the chiral center (A)</p> Signup and view all the answers

How many substituents are directly attached to the α-carbon in amino acids?

<p>3 (B)</p> Signup and view all the answers

Which type of amino acids are classified by the R group into five main classes?

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

Which amino acid residue has a cyclic pyrrolidine ring structure?

<p>Proline (B)</p> Signup and view all the answers

Which class of amino acids is characterized by having aromatic side chains and being relatively nonpolar?

<p>Aromatic (B)</p> Signup and view all the answers

Which amino acid is significantly more polar than phenylalanine due to the presence of a specific functional group?

<p>Tyrosine (B)</p> Signup and view all the answers

What property allows tryptophan and tyrosine to absorb ultraviolet light to a greater extent compared to phenylalanine?

<p>Presence of nitro group (D)</p> Signup and view all the answers

Which group of amino acids participate in hydrophobic interactions due to their nonpolar nature?

<p>Aromatic R groups (C)</p> Signup and view all the answers

Which amino acid residue has an imino group held in a rigid conformation affecting the flexibility of polypeptides?

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

Which amino acid has an aliphatic side chain with a distinctive cyclic structure?

<p>Glycine (C)</p> Signup and view all the answers

What system specifies the absolute configuration of amino acid stereoisomers?

<p>D, L system (B)</p> Signup and view all the answers

What is the significance of the ring structure involving -NH2 in proline?

<p>Holds the imino group in a rigid conformation (B)</p> Signup and view all the answers

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