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Which one of the following is a dipeptide made from α-amino acids? A - VCE - SSCE Chemistry - Question 28 - 2018 - Paper 1
Question 28
Which one of the following is a dipeptide made from α-amino acids? A. CH₃ O CH₃ | | H₂N–C–C–COOH B. H₂N–C–C–CH₂–C–COOH | ... show full transcript
Worked Solution & Example Answer:Which one of the following is a dipeptide made from α-amino acids? A - VCE - SSCE Chemistry - Question 28 - 2018 - Paper 1
Step 1
Which one of the following is a dipeptide made from α-amino acids?
Answer
To determine which option represents a dipeptide made from α-amino acids, we need to analyze the structures presented in the options:
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Understand Dipeptides: A dipeptide consists of two amino acids linked by a peptide bond. Both components must be α-amino acids, characterized by an amino group (-NH₂), a carboxyl group (-COOH), and a side chain (R) connected to a central carbon (Cα).
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Evaluate Each Option:
- A: Contains one amino acid but does not feature a second amino acid, thus not constituting a dipeptide.
- B: This structure has a thiol group (-SH) and additional carbon atoms, making it not a standard dipeptide of α-amino acids.
- C: Features a thiol group, which disqualifies it as it does not represent an α-amino acid structure.
- D: Contains two distinct α-amino acids linked by a peptide bond, fulfilling the dipeptide requirement.
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Conclusion: Based on the analysis, option D is the only structure representing a dipeptide made from α-amino acids.