Understanding Eukaryotic and Prokaryotic Differences Practice Test

A group of researchers in a laboratory have found what they believe to be an unknown organism. They notice that this organism lacks a nuclear membrane and mitochondria. Using this information, which of the following structures would this organism most likely possess?

Prokaryotes and eukaryotes are defined by a series of differences. Which of the following structures is found in one class of cell, but not the other?