Question

a prokaryotic cell does not have
a cell membrane.

genetic material.

a nucleus.

flagella.

Explanation:

Prokaryotic cells are characterized by the absence of a membrane - bound nucleus. They do have a cell membrane, genetic material (in the form of a nucleoid), and some prokaryotes have flagella. So the structure that a prokaryotic cell does not have is a nucleus.

Answer:

B. a nucleus (assuming the options are labeled as A. a cell membrane, B. a nucleus, C. genetic material, D. flagella)