Question

which groups of organisms do not have a defined neucleus or organelles

Answer 1

Prokaryotes ok e.g bacteria

Answer 2

Prokaryotes are divided into two domains, Archaea and Bacteria. In contrast, species with nuclei and organelles are placed in the third domain, Eukaryota.. ... Eukaryotes areorganisms, including humans, whose cells have a welldefined membrane-bound nucleus (containing chromosomal DNA) and organelles.