Which of the following cells would not have a well-defined nucleus but would have s thick cell wall and ribosomes

Bacterial cells

They do not have a well-defined nucleus (unlike plant and animal cells)
They have cell walls (unlike an animal cell)
They have ribosomes

I have attached an image of a bacterial cell. you can see all the structures mentioned above.

I hope this helps! I'm happy to answer any other questions you might have :)

[image sourced from: https://micro.magnet.fsu.edu/cells/bacteriacell.html]

A. mitochondrion b. nucleus