Question

The number of peptide bonds in a 20-residue linear peptide is _______.

Hint:

For a linear peptide: Number of peptide bonds = Number of residues – 1.

Answer 1

Correct Answer: 19

Step 1: Concept.
Each peptide bond links two amino acids.
Therefore, an n-residue linear peptide contains $(n - 1)$ peptide bonds.
Step 2: Substitute values.
\[ \text{Number of peptide bonds} = 20 - 1 = 19 \] Step 3: Conclusion.
Hence, a 20-residue peptide has 19 peptide bonds.