(A) Nucleus
(B) Ribosome
(C) Golgi complex
(D) None of these
🧠 Explanation:
Protein factories of the cell are **ribosomes**, which are tiny structures found in both prokaryotic and eukaryotic cells. They are responsible for synthesizing proteins by translating the genetic code carried by messenger RNA (mRNA) into specific sequences of amino acids. Ribosomes can be free-floating in the cytoplasm or attached to the endoplasmic reticulum, forming the rough ER. Their function is essential for cell growth, repair, and the production of enzymes and hormones. Made of ribosomal RNA (rRNA) and proteins, ribosomes operate as highly efficient molecular machines, ensuring that cells produce the proteins necessary for survival and proper functioning.
