Question

Is the nucleolus membrane-bound?

Answer 1

Nucleolus:

1. In the eukaryotic cells, the nucleolus has a well-ordered structure with four main ultrastructural components.
2. The components can also be further identified as:
   1. Fibrillar Centers: It is a place where the ribosomal proteins seem to be formed.
   2. Granular Components: Before the ribosomes are formed, the components have rRNA which binds to ribosomal proteins.
   3. Dense Fibrillar Components: It has new transcribed RNA, that connects to the ribosomal proteins.
   4. Nucleolar vacuoles: It is present only in plant cells.
3. No, the nucleolus is not a membrane-bound structure.