Small structures in the nucleus of cells responsible for producing ribosomal subunits are called nucleoli.
WHAT IS NUCLEOLUS
Nucleolus is a membrane-less organelle within the nucleus that manufactures ribosomes, which is the cell's protein organelle.
The nucleus is the center organelle in eukaryotic cells. It harbors the genetic material of the cell.
Therefore, small structures in the nucleus of cells responsible for producing ribosomal subunits are called nucleoli.
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