At the beginning of translation, a tRNA molecule carrying a chemically modified _ binds to the _:
Correct answer: A. Methionine, Small ribosomal subunit
- A. Methionine, Small ribosomal subunit
- B. Methionine, Large ribosomal subunit
- C. Tyrosine, Large ribosomal subunit
- D. Tyrosine, Small ribosomal subunit
Explanation
In prokaryotes polypeptides synthesis begins with the formation of the initiation complex. First, the tRNA molecule carrying a chemically modified methionine (called N-formyl methionine) binds to the small ribosomal subunit. A protein called the initiation factor positions the tRNA on the ribosomal surface at the P side, where the peptide bond is formed.
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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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