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Which of the following inactivates the 60S subunit of eukaryotic ribosomes?

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Which of the following inactivates the 60S subunit of eukaryotic ribosomes?

(a) Chloramphenicol

(b) Cycloheximide

(c) Diphtheria toxin

(d) Ricin

I have been asked this question by my college director while I was bunking the class.

This intriguing question originated from Protein Synthesis in section DNA, RNA and Protein Metabolism of Biochemistry

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The correct choice is (d) Ricin

The best I can explain: Ricin inactivates the 60S subunit of eukaryotic ribosomes by depurinating a specific adenosine in 23S r-RNA.

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