Question

1. in the diagram above, two amino acids are covalently bonded together through a condensation reaction to make a dipeptide. a peptide bond is a covalent bond linking two amino acids together. therefore, a long chain of amino acids is called a polypeptide.

\ta. draw an arrow to the peptide bond in the dipeptide shown in the diagram above.
\tb. between which two specific atoms in the dipeptide is the peptide bond located?
\tc. between what two functional groups (one on each amino acid) does the bond form?

1. put a box around the atoms on each amino acid in the diagram that will become the h₂o molecule produced by the condensation reaction.

Explanation:

a. The peptide bond is the -CO - NH - bond in the dipeptide structure. You would draw an arrow to this bond.
b. The peptide bond is located between the carbon (C) of the carbonyl group (C=O) of one amino - acid and the nitrogen (N) of the amino group (-NH₂) of the other amino - acid.
c. The bond forms between the carboxyl group (-COOH) of one amino acid and the amino group (-NH₂) of the other amino acid. In the condensation reaction, the -OH from the carboxyl group and an -H from the amino group are lost to form water, and the remaining parts (C and N) form the peptide bond. For the atoms that form water, the -OH from the carboxyl group of one amino acid and an -H from the amino group of the other amino acid are the ones that will be part of the water molecule produced.

Answer:

a. Draw an arrow to the -CO - NH - bond in the dipeptide.
b. Carbon (C) and Nitrogen (N).
c. Carboxyl group (-COOH) and Amino group (-NH₂).

1. Box the -OH from the carboxyl group of one amino acid and an -H from the amino group of the other amino acid.