Tripeptides

[MedPR]

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Found this online.

Answer is C. Why?

If you label the sidechains 1, 2, 3 from left to right, you can get the following tripeptide sequences.

1, 2, 3
1, 3, 2
2, 1, 3

Any other combinations are just rewrites of those 3...

 

[chiddler]

no you have to remember that there is polarity. 123 is not equal to 321 because in 123, the N side is the 1 and the C side is the 3. For 321, the N side is 3, the C side is 1.

 

[MedPR]

no you have to remember that there is polarity. 123 is not equal to 321 because in 123, the N side is the 1 and the C side is the 3. For 321, the N side is 3, the C side is 1.

Ah crap, thanks.

So still only those 3 combinations, but from both directions. = 6.

!