Prokaryotes

a. Enclose all their DNA in the nucleus

b. Have a cell membrane

c. Do not perform mitosis.

d. Have their DNA in a single chromosome shaped in a circle

Option (b), (c) and (d).

Explanation:

Prokaryotes lacks the membrane bound organelle and the nucleus is absent in the prokaryotes. Prokaryotes includes only the simple organism like bacteria.

Prokaryotes have the cell wall and the cell membrane. Prokaryotes multiply by asexual reproduction and mitosis is absent in prokaryotes. The prokaryotes have single circular shaped chromosome DNA prsent inside the nucleoid.

Thus, the correct answer is option (b), (c) and (d).