Amino acids and proteins Quiz
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5 questions, one answer each
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1. Which is the main form of glycine in neutral aqueous solution?
- A. H₂NCH₂COOH
- B. ⁺H₃NCH₂COO⁻
- C. ⁺H₃NCH₂COOH
- D. H₂NCH₂COO⁻
2. Which amino acid does not show optical activity?
- A. Alanine, CH₃CH(NH₂)COOH
- B. Both glycine and alanine
- C. Glycine, H₂NCH₂COOH
- D. Neither glycine nor alanine
3. What is formed when two amino acids react to form a dipeptide?
- A. A peptide bond and water
- B. An ester link and water
- C. An amide link and HCl
- D. A peptide bond and ammonia
4. Why is a 50:50 mixture of two enantiomers optically inactive?
- A. The molecules are not chiral
- B. Rotations are equal and opposite and cancel
- C. Both enantiomers are zwitterions
- D. The solution is too dilute
5. What is observed when dilute acid is added to sodium carbonate solution?
- A. A white precipitate
- B. A pale blue precipitate
- C. Ammonia gas
- D. Effervescence of carbon dioxide