Q. The number of tripeptides formed by three different amino acids are

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Solution:

Let Ala, gly and Phe be the three -amino acids.The will form the following six tripeptides
Ala-Gly-Gly Gly-Ala-Phe Phe- Ala-Gly Ala-Phe-Gly Gly-Phe-Ala Phe-Gly-Ala.