Once elongation is underway, tRNAs involved in the process occupy a series of sites on the complexed ribosome. The occupation of sites occurs in the following order. A) A Site, P Site, E Site, S SiteB) P Site, E Site, A SiteC) A Site, S Site, E SiteD) A Site, P Site, E SiteWhen a peptide bond is formed between two amino acids, one is attached to the tRNA occupying the P site and the other .A) is free in the cytoplasmB) Is attached to the tRNA occupying the E siteC) is attached through hydrogen bonds to the mRNAD) is attached to the tRNA occupying the A siteWhich of the following statements concerning peptide bond formation is correct?A) It is catalyzed by an enzymatic protein. B) It uses waterC) It requires GTPD) It is catalyzed by peptidul transferase

1. A 2. D 3. D

Explanation:

The ribosome is the organelle in which translation of mRNA to proteins/polypeptides occurs. Occupation of sites by the tRNA in the ribosome follows the order:

A (aminoacyl) site through which new tRNA bearing amino acids comes in

P (peptidyl site) where peptide bonds occurs and also bearing the growing polypeptide chain

E (exit) site where tRNA leaves the ribosomes after release of the amino acid

The pepetide bond forms between the amino acid in the A and P site. Peptide bond formation in the ribosomes is catalyzed by peptidyl transferase made up mainly of rRNA, also a form of riboszyme

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