Ribosomes provide the scaffolding on which tRNAs interact with mRNA during translation of an mRNA sequence to a chain of amino acids. A ribosome has three binding sites, each of which has a distinct function in the tRNA-mRNA interactions. Drag the appropriate tRNAs to the binding sites on the ribosome to show the configuration immediately before a new peptide bond forms. Note that one of the binding sites should be left empty.

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QuartzQuartz3201 QuartzQuartz3201

25-07-2019
Biology

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Ribosomes provide the scaffolding on which tRNAs interact with mRNA during translation of an mRNA sequence to a chain of amino acids. A ribosome has three binding sites, each of which has a distinct function in the tRNA-mRNA interactions. Drag the appropriate tRNAs to the binding sites on the ribosome to show the configuration immediately before a new peptide bond forms. Note that one of the binding sites should be left empty.

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salomech96 salomech96 · Answer 1 · 2019-08-03T02:38:52+02:00

Answer: Two tRNA should be placed on the ribosome P and A binding sites. The tRNA who has an attached codon corresponding to the mRNA codon above P site should be dragged on P site, and the tRNA who has an attached codon corresponding to the mRNA codon above A site should be dragged on A binding site. E binding site on the ribosome should be left empty.

Explanation:

The large ribosome unit in translation has 3 binding sites:

1. E binding site (Exit site) which is empty after an amino acid bond is formed (Because after it is formed, a previous tRNA had to leave this Exit site)

2. P binding site (Polypeptide site) which is the place in which the aminoacid bond is formed.

3. A binding site (Aminoacid site) in which new amino acids are welcome according to the mRNA lead, to build another peptide bond.

All tRNA passes through all these sites but immediately a new peptide bond forms we have the P and A sites occupied. Then they will shift to the left and one of the tRNA will leave after being in E site, and the other will remain on the P site, waiting for another peptide bond to be formed.