30 points
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- IIT JAM
- Biotechnology (BT)
A. suppose that a particular cell has 30 different kinds of transfer-rna molecules, each with one of 20 possible amino acids attached at its distal end. on aver
a. Suppose that a particular cell has 30 different kinds of transfer-RNA molecules, each with one of 20 possible amino acids attached at its distal end. On average, how many different sets of codon triplets in the messenger- RNA chain would each transfer-RNA have to recognize, in order to make all the proteins necessary for cell growth? Give a number for your answer and show how you deduce it. 2.01
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Abhijeet Gaurav Best Answer
This question can be dealt under different conditions :- There are 64 Codons 1 Codon codes for fmet that is the start codon so only one such. 3 codons are STOP Codon so none synthesis after that. Now that 30 different tRNAs are there with each of the possibilities to bind 20 amino acids at it's distal end. So if we consider fmet coding Codon as only & only one specific tRNA for it then = (64-3-1) ÷ (30-1) = 60÷29 If we don't consider 1st Codon one specific as there can be more Met in the Sequence then (64-3-1)÷ 30 = 60÷30 So there can answer based on these conditions.
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i did the same(second possibility) but wasn't confident thank you so much sir
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Abhijeet Gaurav![best-answer]()
Yes question is not very specific that's why I took these conditions. Even few amino acids such as Trp & Tyr usually have 1 Codon or so & are very less in Number in Proteins. So we can consider that also but since it's not very specific so 60÷30 would be the answer.