JAMB - Biology (2007 - No. 27)

The chromosomes of monerans are located in the cytoplasm of the cell in a region called the nucleoid.

Monerans are prokaryotic organisms, which means they lack a true nucleus. However, they also do not have nucleolus. The DNA of monerans is circular and made of a double helical molecule. The DNA is not contained within a membrane-bound nucleus, but is instead found in the cytoplasm. Some species of bacteria have additional rings of DNA called plasmids. Plasmids replicate along with the bacterial chromosome and carry genes for antibiotic resistance. 

In summary, monerans do not have nucleolus and nucleoplasm because they lack a true nucleus. Instead, their DNA is found in a region of the cytoplasm called the nucleoid.