Protein Composition and Functions
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Questions and Answers

Which of the following biomolecules accounts for more than 50% of the dry mass of most cells?

  • Proteins (correct)
  • Carbohydrates
  • Nucleic acids
  • Lipids

    • What are the functions of proteins in cells?

  • Structural support and defense against foreign substances (correct)
  • Energy storage and transfer
  • Cellular respiration
  • DNA replication and transcription

    • What are the four different groups attached to the α-carbon in an amino acid?

  • Carboxyl group, Hydroxyl group, Amino group, and R group
  • Amino group, COOH group, Hydrogen atom, and R group (correct)
  • Amino group, COOH group, Hydroxyl group, and R group
  • Carboxyl group, Hydrogen atom, Hydroxyl group, and R group

    • What determines the unique characteristics of a particular amino acid?

    <p>Physical and chemical properties of the side chain (R group)</p> Signup and view all the answers

    What is the charge of acidic amino acids?

    <p>Negative</p> Signup and view all the answers

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