Chemistry · Grades 10–12
Peptide links in a linear chain
A single unbranched noncyclic peptide with n amino-acid residues has n − 1 links between adjacent residues.
Rule and assumptions
A single unbranched noncyclic peptide with n amino-acid residues has n − 1 links between adjacent residues.
links = residues − 1 for a simple linear chain
Worked examples
A simple unbranched, noncyclic peptide contains 8 amino-acid residues. How many peptide links connect adjacent residues? Round to 3 decimal places if needed.
links = residues − 1 for a simple linear chain 8 − 1 = 7
7
A simple unbranched, noncyclic peptide contains 60 amino-acid residues. How many peptide links connect adjacent residues? Round to 3 decimal places if needed.
links = residues − 1 for a simple linear chain 60 − 1 = 59
59
Try two questions
A simple unbranched, noncyclic peptide contains 172 amino-acid residues. How many peptide links connect adjacent residues? Round to 3 decimal places if needed.
A simple unbranched, noncyclic peptide contains 95 amino-acid residues. How many peptide links connect adjacent residues? Round to 3 decimal places if needed.
Answers and reasoning
Answers and marking notes
- 171
links = residues − 1 for a simple linear chain 172 − 1 = 171
- 94
links = residues − 1 for a simple linear chain 95 − 1 = 94
Further reading and review references
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