The Student Room Group
1) Try out different combinations:
Ser - Lys - Ala
Ser - Ala - Lys
Lys - Ser - Ala
Lys - Ala - Ser
Ala - Lys - Ser
Ala - Ser - Lys

So I think there's 6 (correct me if I'm wrong...)

2) This is the general formula for each of these tripeptides (replace 'R' with the R groups on these amino acids):

H2N-CHR-CO-NH-CHR-CO-NH-CHR-COOH

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