Question 1185640
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In how many ways can four different amino acids be arranged into a polypeptide chain of five amino acids?
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As far as I know,  at this forum,  no one of our tutors is biologist or molecular biologist, or biochemist, or organic chemist.


Therefore,  I will not answer your question,  as it is posed in the post.


I will answer another question.



            In how many different ways   4  different items can be distributed  in  5  different boxes 

        having no more than one item per box?



<pre>
The answer is  5*4*3*2 = 120 different ways,  by placing 

    item 1 in any of 5 boxes,

    item 2 in any of remaining 4 boxes,

    item 3 in any of remaining 3 boxes,

    item 4 in any of remaining 2 boxes.
</pre>


It would be interesting to me to learn it from you, &nbsp;if my response/solution really answers your question.


PLEASE let me know.