Which structure manufactures the components of ribosomes?endoplasmic reticulumnucleoluscytoplasmnucleus

Step 1: Break Down the Problem

We need to identify which structure is responsible for manufacturing the components of ribosomes from the given options.

Step 2: Relevant Concepts

1. Nucleus: Contains the genetic material and is involved in the cell's regulation of activities, including ribosome production.
2. Nucleolus: A specific region within the nucleus responsible for synthesizing ribosomal RNA (rRNA) and assembling ribosome subunits.
3. Endoplasmic Reticulum: Involved in protein and lipid synthesis, not directly in ribosomal subunit manufacture.
4. Cytoplasm: The fluid within the cell where ribosomes function but not where they are made.

Step 3: Analysis and Detail

• The nucleolus is known for rRNA synthesis and the initial assembly of ribosomal subunits. The nucleolus gathers proteins imported from the cytoplasm and combines them with rRNA to form the subunits of ribosomes.
• The nucleus contains the nucleolus, and while it plays a critical role in the overall coordination of ribosome production, it is the nucleolus that specifically manufactures ribosomal components.
• The endoplasmic reticulum and cytoplasm are primarily involved in the translation of mRNA and protein synthesis rather than the manufacture of ribosomal components.

Step 4: Verify and Summarize

After analyzing each component, it is clear that the nucleolus is the specific structure responsible for manufacturing the components of ribosomes.

Final Answer

The structure that manufactures the components of ribosomes is the nucleolus.