What organelle is responsible for making ribosomes?

The nucleus is responsible for making ribosomes, specifically through a region within it known as the nucleolus. The nucleolus is where ribosomal RNA (rRNA) is synthesized and combined with ribosomal proteins to form the subunits of ribosomes. These subunits exit the nucleus through nuclear pores into the cytoplasm, where they combine to form functional ribosomes, which are essential for protein synthesis in the cell.

Other organelles listed have different functions; for example, the centrosome is primarily involved in organizing microtubules and is crucial for cell division. The Golgi body is responsible for modifying, sorting, and packaging proteins and lipids for secretion or delivery to other organelles. The cytoplasm is the fluid matrix within the cell that supports organelles but does not directly synthesize ribosomes. Thus, the nucleus stands out as the organelle specifically designed for the production of ribosomes.