A polypeptide chain contains 12 amino acids. If the average molecular weight of an amino acid residue is 110 Da, what is the approximate molecular weight of the chain?
Answer
1320 Da
The correct answer is 1320 Da — Hence the molecular weight is approximately 1320 Da.
Step-by-step solution
- Use the formula: Molecular weight = (number of residues) × (average residue mass).
- Number of residues = 12.
- Average residue mass = 110 Da.
- Multiply: 12 × 110 = 1320 Da.
- Hence the molecular weight is approximately 1320 Da.
Common mistake: Forgetting to multiply residue count by average mass
Concept tested: Molecular weight of polypeptide
Published · How this solution was prepared and checked
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