The number of different tripeptides that can be formed containing all three amino acids, glycine, alanine and serine, is A - VCE - SSCE Chemistry - Question 18 - 2003 - Paper 1

To find the number of different tripeptides formed using three amino acids (glycine, alanine, and serine), we consider the permutations of these amino acids. Since all amino acids are distinct, we can simply use the permutation formula:

$P(n) = n!$

where ( n ) is the number of amino acids. Therefore, we have:

$P(3) = 3! = 3 \times 2 \times 1 = 6$