Which cellular organelle is the site of ribosome synthesis?

Study for the Manor Preboards Module 2 Test. Use flashcards and multiple choice questions that include hints and explanations. Prepare thoroughly for your exam!

Multiple Choice

Which cellular organelle is the site of ribosome synthesis?

Explanation:
Ribosome synthesis happens in the nucleolus, a dense region inside the nucleus where ribosomal RNA (rRNA) genes are transcribed and the ribosomal subunits begin to assemble. Here, rRNA is produced and combines with ribosomal proteins that are made in the cytoplasm and then imported back into the nucleus. The initial assembly of the small and large ribosomal subunits starts in this region, and once formed, these subunits are exported to the cytoplasm to become functional ribosomes for protein synthesis. Other organelles don’t carry out this initial rRNA transcription or subunit assembly, though they handle subsequent protein processing and trafficking. The nucleus houses DNA, but the specific site for producing rRNA and initiating ribosome assembly is the nucleolus.

Ribosome synthesis happens in the nucleolus, a dense region inside the nucleus where ribosomal RNA (rRNA) genes are transcribed and the ribosomal subunits begin to assemble. Here, rRNA is produced and combines with ribosomal proteins that are made in the cytoplasm and then imported back into the nucleus. The initial assembly of the small and large ribosomal subunits starts in this region, and once formed, these subunits are exported to the cytoplasm to become functional ribosomes for protein synthesis. Other organelles don’t carry out this initial rRNA transcription or subunit assembly, though they handle subsequent protein processing and trafficking. The nucleus houses DNA, but the specific site for producing rRNA and initiating ribosome assembly is the nucleolus.

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