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    Biology
    Grade-7
    Easy

    Question

    Which of the following is required for the formation of protein?

    1. Oxygen 
    2. Hydrogen
    3. Nitrogen
    4. Phosphorus

    Hint:

    All amino acids contain this atom.

    The correct answer is: Nitrogen

      • Nitrogen is the unique atom present in proteins
      • Amino acids can be represented as R-CH(NH2)-COOH
      • All amino acids contain amino groups (NH subscript 2)
      • Besides, carboxyl and R group specific for the amino acid is also found in the amino acid
      • The excess nitrogen consumed through food is eliminated in the form of urea by humans

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