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What discovery was stated by Robert Traut and Munro experiment?

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What discovery was stated by Robert Traut and Munro experiment?

(a) 30S subunit is binding to IF

(b) 50S subunit has peptidy transferase activity

(c) rRNA has peptifyl transfer activity

(d) Urea prevents peptide bond formation

I had been asked this question in class test.

This intriguing question originated from Ribosome as Ribozyme in portion Gene Expression : Translation of Cytogenetics

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Right option is (b) 50S subunit has peptidy transferase activity

Easiest explanation: In Robert Traut and Munro experiment puromycin was used as an assay of peptidyl transfer activity. They observed that rRNA was able to transfer the amino acid chain from tRNA on P site to the aminoacyl tRNA on A site.

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