Look up in your book or notes the structure of the dipeptide Gly-Ala (or look at

Question

Look up in your book or notes the structure of the dipeptide Gly-Ala (or look at this Jmol rendition of Gly-Ala). Which statement is true about the different functional groups in this molecule?
Answer

a. An amino group and an amide group are attached to the glycine (Gly) central (alpha) carbon.
b. An amino group and a carboxylic acid group are attached to the glycine (Gly) residue and the alanine (Ala) residue.
c. The dipeptide Gly-Ala could have the amino group attached to the glycine (Gly) or to the alanine (Ala). Either way of writing it would be correct.
d. A carboxylic acid group and an amide group are attached to glycine (Gly) central (alpha) carbon.

Explanation / Answer

a. An amino group and an amide group are attached to the glycine (Gly) central (alpha) carbon.

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