SOLUTION: An octapeptide is known to contain four of one amino acid, two of another, two of third.How many different amino acids sequence are pissible
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Question 1092600: An octapeptide is known to contain four of one amino acid, two of another, two of third.How many different amino acids sequence are pissible Found 2 solutions by addingup, ikleyn:Answer by addingup(3677) (Show Source):
You can put this solution on YOUR website! Does order matter? Is there a specific way they have to be combine? If you have to watch the order of the arrangement... you don't have enough information.
IF order doesn't matter, then:
4+2+2 = 8
8*7*6*5*4*3*2 = 8! = number of combinations
But you sent it again, and it is VERY GOOD, because I changed my mind comparing with my earlier posts.
I made my small research in the Internet regarding "octapeptide".
What I learned in relation to our problem is THIS:
1. Octapeptide is an line chain of 8 amino acids.
2. These elementary amino acids may repeat in the chain. Repeating is allowed.
3. For our problem it does not matter that there are 4 amino acids of one type,
2 amino acids of the other type and 2 amino acids of the third type.
4. I still didn't find if there are restrictions for the order of placing amino acids in the line.
I suspect that a compehensive answer to this last question is in dark for chemists/biochemists.
I will ASSUME that the problem asks in how many ways 8 different amino acids can be placed in a row if repeating is allowed.
Then the answer is: in = 16777216 ways.
Any of 8 in the first position.
Any of 8 in the second position.
Any of 8 in the third position.
........ and so on .......
Any of 8 in the eighth position.
In all, = 16777216 ways.
