Question

what is the function of the nucleolus?
a it is where the ribosomes are assembled.
b it controls the heredity characteristics of an organism.
c it is responsible for protein synthesis, cell division, growth and differentiation.
d it regulates the integrity of genes and gene expression.

Explanation:

The nucleolus is a sub - structure within the nucleus. Its main function is ribosome assembly. DNA in the nucleolus codes for ribosomal RNA (rRNA), and rRNA combines with ribosomal proteins to form ribosomal subunits. These subunits are then transported out of the nucleus to form functional ribosomes in the cytoplasm. The other options describe functions of the nucleus as a whole or other organelles.

Answer:

A. It is where the ribosomes are assembled.