Tripeptides are composed of three amino acids linked by peptide bonds. Given a s

Question

Tripeptides are composed of three amino acids linked by peptide bonds. Given a set of amino acids, you can make several different tripeptides.

Use the three-letter shorthand notations to name all the isomeric tripeptides that can be made from serine, tyrosine, and glycine. Each amino acid will be used once in each tripeptide.

Enter your answers separated by commas. Use alphabetic order

I have tried it these 4 ways and its still wrong,

1. Ser,Tyr,Gly,

Ser,Gly,Tyr,

Tyr,Gly,Ser,

Tyr,Ser,Gly,

Gly,Ser,Tyr,

Gly,Tyr,Ser

2. Ser,Tyr,Gly,Tyr,Gly,Ser,Gly,Ser,Tyr,Gly,Tyr,Ser,Tyr,Ser,Gly,Ser,Gly,Tyr

3. SYG,YGS,GSY,GYS,YSG,SGY

4. GSY,GYS,SGY,SYG,YGS,YSG

Explanation / Answer

Ser-Tyr-Gly, Ser-Gly-Tyr, Tyr-Gly-Ser, Tyr-Ser-Gly, Gly-Tyr-Ser, Gly-Ser-Tyr

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