Question

Which of these is not a structure found in prokaryotic cells?
a defined nucleus
ribosomes
cytoplasm
cell membrane

Answer 1

Prokaryotes: Organisms whose cells lack a nucleus and therefore have DNA floating loosely in the liquid center of the cell. Prokaryotes divide, and thus reproduce, by simple mitosis.

Eukaryotes: Organisms that have a well-defined nucleus to house and protect the DNA. Eukaryotes divide by meiosis for sexual reproduction.

source: http://www.dummies.com/how-to/content/how-cells-work-prokaryotes-and-eukaryotes.html

Answer 2

Does that answer your question? :D

Answer 3

Yes, thanks

Answer 4

No problem!