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What is this peptide bond related question asking?

What is this peptide bond related question asking? - Peptide Forum

What is this peptide bond related question asking? - Peptide Forum. Ask and discuss questions on peptide protocols, custom peptide synthesis, peptide identification and peptide sequencing.


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Old 07-18-2011, 07:16 AM
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Default What is this peptide bond related question asking?



I got a homework question that asks the following.
"How many different tripeptides can be formed from one molecule each of the amino acids tyrosine, valine, and alanine?"

However, I'm not quite sure I understand what its asking.
I thought "maybe its asking how many peptide bonds are needed to bond the three amino in which case the answer would be 2." However, these are tripeptides we are talking about and it only gives 3,6,9,12,24 as answer choices. So If I were to pick 3 that would mean I have 9 peptide bonds throughout the whole protein chain???? Please help this confused chemistry student!








Notice: Please do not use my question to advertise something for sell or cheat by saying "I don't know" or "google it" or anything to that matter. I report cheaters.
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Old 07-25-2011, 06:17 AM
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Smile Re: What is this peptide bond related question asking?

Question is asking how many different type of tripeptide is possible i.e

Tyr-Val-Ala
Tyr-Ala-Val
Ala-Tyr-Val
Val-Tyr-Ala
Ala-Val-Tyr
Val-Ala-Tyr

total six possibility
and calculation is as simple as if
2 different amino acid then possibility = 2x1 = 2
3 different amino acid then possibility = 3x2x1 = 6
4 different amino acid then possibility = 4x3x2x1 = 24

and if same amino acid used more then one time in single possibility then formula for calculation is


n power to n where n is no. of amino acid

thus if three amino acid then possibility is 3 to power of three = 27
e.g. Tyr-Tyr-Tyr,
Ala-Ala-Ala,
Val-Val-Val,
Tyr-Val-Val,
Val-Ala-Ala etc. (Total 27)

regards
Kunal Pandya
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