How many different tripeptides can be made from two molecules of the amino acid valine (val)and one molecule of the amino acid alanine (ala)?
A)4
B)3
C)1
D)5 or more
E)2

Question

Quizplus · Accepted Answer

The three amino acids can be arranged in six different ways (VVV, VVA, VAV, AVV, AAV, and AVA). However, VVV is not a valid tripeptide since it only contains one amino acid. Therefore, there are only three possible tripeptides: VVA, VAV, and AVA.

How Many Different Tripeptides Can Be Made from Two Molecules