Which of the following cells would not have a well–defined nucleus but would have a thick cell wall and ribosomes?
onion cell
e. coli bacteria
human brain cell

Onion cell

A Eukaryotic cell contains a nucleus; more than one chromosome and is typically a multicelled organism.  Both plant and animal cells are eukaryotic cells, but there are differences between the two. A plant cell has a cell wall while an animal cell does not have a cell wall. A plant cell is a regular shape and an animal cell is an irregular shape. Both plant and animal cells have a nucleus. There are just a few examples of the differences between Eukaryotic and Prokaryotic cells.