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  2. 3.1.8. State the chemical composition of a protein molecule..

3.1.8. State the chemical composition of a protein molecule..

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    Chemical Composition of Proteins

    Basic Building Blocks

    Proteins are complex molecules made up of smaller units called amino acids. Let's break down their chemical composition:

    1. All amino acids contain:
      • An amino group (-NH₂)
      • A carboxyl group (-COOH)
      • A central carbon atom (α-carbon)
      • A side chain (R group)

    The R group is what makes each amino acid unique and gives it specific properties.

    Chemical Elements

    The main elements found in proteins are:

    • Carbon (C)
    • Hydrogen (H)
    • Oxygen (O)
    • Nitrogen (N)
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    What are proteins composed of?