Protein synthesis is the main function of which of the following structures? (A) Nucleus (B) Ribosome (C) Chromosome (D) Mitochondrion (E) Vacuole

(B) Ribosome

Explanation:

The ribosome is an organelle composed of RNA proteins and the ribosomal RNA. The proteins and rRNA form the two subunits: the small and large subunit. The ribosomes either attached to the endoplasmic reticulum or float freely in the cytoplasm of the cell.

The structure of RNA contains three sites called A, P and E sites which helps in the "synthesis of proteins" from the mRNA molecule. The mRNA produced in the nucleus gets transported from the nucleus to the ribosomes attached to the endoplasmic reticulum and the proteins are synthesized by the process of translation.

Thus, Option-B is the correct answer.

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