Which cellular structure is primarily involved in protein synthesis?

Which cellular structure is primarily involved in protein synthesis?

• A. Ribosome
• B. Golgi Apparatus
• C. Lysosome
• D. Mitochondrion

Answer: (A)

Protein synthesis is carried out by ribosomes, the molecular machines that translate genetic information into polypeptide chains. They read messenger RNA and catalyze peptide bond formation to build proteins. In eukaryotic cells, ribosomes can be free in the cytosol or bound to the rough endoplasmic reticulum, enabling production of cytosolic proteins as well as secreted or membrane-bound ones. The Golgi apparatus then processes and ships these proteins, but does not assemble them. Lysosomes are involved in digestion and waste breakdown, not synthesis. Mitochondria generate most of the cell’s ATP and contain some ribosomes for a small set of mitochondrial proteins, but they are not the primary site of synthesis for most cellular proteins. Therefore, the structure primarily involved in protein synthesis is the ribosome.

Protein synthesis is carried out by ribosomes, the molecular machines that translate genetic information into polypeptide chains. They read messenger RNA and catalyze peptide bond formation to build proteins. In eukaryotic cells, ribosomes can be free in the cytosol or bound to the rough endoplasmic reticulum, enabling production of cytosolic proteins as well as secreted or membrane-bound ones. The Golgi apparatus then processes and ships these proteins, but does not assemble them. Lysosomes are involved in digestion and waste breakdown, not synthesis. Mitochondria generate most of the cell’s ATP and contain some ribosomes for a small set of mitochondrial proteins, but they are not the primary site of synthesis for most cellular proteins. Therefore, the structure primarily involved in protein synthesis is the ribosome.