Question

The number of possible tripeptides formed involving alanine (ala), glycine (gly) and valine (val), where no amino acid has been used more than once is

• A. 3
• B. 6
• C. 8
• D. 4

Hint:

When sequence matters and repetition is not allowed, always use permutations.

Answer 1

The Correct Option is B

Step 1: Understanding the concept.
A tripeptide consists of three amino acids joined in a specific sequence. The order of amino acids matters, and no amino acid can be repeated.
Step 2: Counting permutations.
Three different amino acids (ala, gly, val) can be arranged in $3!$ different ways.
\[ 3! = 6 \]
Step 3: Conclusion.
Thus, six different tripeptides can be formed.