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Which was the first artificially synthesized polypeptide?

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Which was the first artificially synthesized polypeptide?

(a) polyphenylalanine

(b) tyrosine

(c) valine

(d) polyisoleucine

I had been asked this question in an interview for job.

My enquiry is from Gene Expression topic in chapter Gene Expression of Cell Biology

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Correct answer is (a) polyphenylalanine

Best explanation: The first artificially synthesized protein is polyphenylalanine, synthesized using the poly(U) genetic sequence. After the successful synthesis of polyphenylalanine, it was confirmed that the codon UUU specifies phenylalanine.

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