Question

What role does the EPA site on the Ribosome play during translation? Explain with help of a diagram. Also explain how codons, tRNA & anticodons play a role during translation (2 points)

What is an Inducible operon? Give an example and explain the steps in the functioning of one such operon. You may use a diagram to explain your answer (2 points)

Answer 1

Answer=

The role of EPA site on the ribosome during translation is as follows:

A site- called as acceptor This accepts the incoming aminoacyl tRNA during the process of translation.

P site- peptidyl site binds tRNA,holding the polypeptide chain of amino acids.

binding of tRNA to the P-site in the presence of mRNA establishes codon-anticodon interaction.

E site- called as exit site ,through which polypeptide chain is exit.

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Role of codons during translation - Codons code for peptide sequence.

codons are present on mRNA,when tRNA carrying the next amino acid in the polypeptide chain has anticodon that binds to the appropriate location on the mRNA.This system ensures that amino acids are added to the correct order.

Role of tRNA during translation -tRNA molecule contains a set of three nucleotides called an anticodon.

It also carries an amino acid specifically ,the encoded by the codons that tRNA binds.

Role of anticodons during translation -anticodons are found on tRNA .their function is to base pair with the codon on a strand of mRNA during translation.

-to decode a specific amino acid.

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