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A polypeptide chain has a free amino group at one end. That end is called the:
AC terminal
BN terminal
CR terminal
DP terminal
Answer & Solution
Correct answer: B. N terminal
1. Amino acids join through peptide bonds to form a chain with two distinct ends.
2. One end still carries a free amino group and the other a free carboxyl group.
3. The end with the free amino group is the N terminal, or amino terminal.
4. The opposite end is the C terminal, also called the carboxyl terminal.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 3 'Biological Macromolecules', sections 3.1-3.5_
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