Amino acids and proteins

Amino acids and proteins Quiz

Spec 18B · Edexcel A-Level Chemistry: Quiz

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5 questions, one answer each

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  1. 1. Which formula represents the zwitterion of glycine?

    • A. H₂NCH₂COO⁻
    • B. ⁺H₃NCH₂COOH
    • C. H₂NCH₂COOH
    • D. ⁺H₃NCH₂COO⁻

  2. 2. What is lost when two amino acids form a peptide bond?

    • A. Ammonia
    • B. Carbon dioxide
    • C. Water
    • D. Hydrogen

  3. 3. In which species does alanine exist in strongly alkaline solution?

    • A. CH₃CH(NH₃⁺)COOH
    • B. CH₃CH(NH₂)COO⁻
    • C. CH₃CH(NH₃⁺)COO⁻
    • D. CH₃CH(NH₂)COOH

  4. 4. A spot moves 3.5 cm when the solvent front moves 7.0 cm. What is its Rf value?

    • A. 0.50
    • B. 2.0
    • C. 3.5
    • D. 0.20

  5. 5. Why is a solution of alanine made in the laboratory optically inactive?

    • A. Alanine is not chiral
    • B. The synthesis gives equal amounts of both enantiomers
    • C. Alanine absorbs polarised light
    • D. It exists only as a zwitterion

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