Sunita Marandi posted an Question
May 23, 2020 • 12:52 pm 30 points
  • IIT JAM
  • Biotechnology (BT)

Why 50s + 30s=70s ribosome?

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  • Sunita marandi

    thank you for the answer but....if we add mathematically then it is incorrect so can you explain please why mathematical addition is not considered here?

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    mathematics is not apply here. this is a ribosome not a mathematical no.

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    Narayan singh best-answer

    The S in the ribosomal subunits stand for sevdberg units named so in honour of the scientist Theador Svedberg and represent the different sedimentation rates of the ribosomes during centrifugation. While the larger subunit sediments at 50S and the smaller at 30S together they sediment at 70S. Protein synthesis begins with the interaction of the 30S subunit and mRNA through the Shine-Delgarno sequence. On formation of this complex, the initiator tRNA charged with formylmethionine binds to the initiator AUG codon, and the 50S subunit binds to the 30S subunit to form the complete 70S ribosome.

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