Which organelle manufactures ribosomes?

Which organelle manufactures ribosomes?

• A. Nucleolus
• B. Nucleus
• C. Endoplasmic reticulum
• D. Golgi apparatus

Answer: (A)

Ribosome production happens in the nucleolus, a dense region inside the nucleus where ribosomal RNA genes are transcribed and ribosomal subunits begin to assemble. Here, rRNA is produced and combined with ribosomal proteins imported from the cytoplasm to form the small and large subunits, which then exit to the cytoplasm to become functional ribosomes. The endoplasmic reticulum is where ribosomes can be attached for translating proteins, but it doesn’t manufacture ribosomes; the Golgi processes and ships proteins, not ribosome assembly.

Ribosome production happens in the nucleolus, a dense region inside the nucleus where ribosomal RNA genes are transcribed and ribosomal subunits begin to assemble. Here, rRNA is produced and combined with ribosomal proteins imported from the cytoplasm to form the small and large subunits, which then exit to the cytoplasm to become functional ribosomes. The endoplasmic reticulum is where ribosomes can be attached for translating proteins, but it doesn’t manufacture ribosomes; the Golgi processes and ships proteins, not ribosome assembly.