_is responsible for making ribosomal RNAs (rRNA)
Correct answer: C. Nucleolus only
- A. Nucleus only
- B. Nucleus & nucleolus only
- C. Nucleolus only
- D. None of the above
Explanation
The nucleolus, found within the nucleus, is the specific structure responsible for the synthesis of ribosomal RNA (rRNA) and the assembly of ribosome subunits. Option C is correct because it identifies the nucleolus as the only structure responsible for these functions. The other options include structures that do not specifically perform this role or incorrectly suggest that no structure is responsible.
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