How many tripeptides can be prepared by linking the amino acids glycine, alanine and phenyl alanine?

Explanation

To determine how many tripeptides can be prepared by linking the amino acids glycine (G), alanine (A), and phenylalanine (F), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Tripeptides**:
A tripeptide consists of three amino acids linked together. In this case, we have three different amino acids: glycine (G), alanine (A), and phenylalanine (F).

2. **Identify the Number of Amino Acids**:
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