The movement of the ribosome on mRNA translocates the initial tRNA to the _ site and ejects it from the ribosome:
Correct answer: D. E
- A. A
- B. P
- C. U
- D. E
Explanation
The movement of ribosomes along the mRNA molecule in the 5' → 3' direction translocates the initial tRNA to the E site and ejects it from the ribosome. The E site is where the empty tRNA exits the ribosome after it has released its amino acid, and the P site is where the tRNA carrying the growing polypeptide chain is located. The A site is where the incoming aminoacyl-tRNA pairs with the mRNA codon. The U site is not a recognised site in ribosomal function.
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About Chromosomes
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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