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The following do not conform to the characteristics of prokaryotes: (a) No chromosome, DNAB. There is no cell structure, no cell membrane, C. autotrophic or heterotrophic D. Only the nucleus.
A, prokaryotic cells have no chromosomes, but contain DNA. A is wrong;

B, all prokaryotic cells have cell membranes, and B is correct;

C. There are both autotrophs and heterotrophs in prokaryotes. For example, cyanobacteria belong to autotrophs, while Escherichia coli belongs to heterotrophs. C is wrong;

D. Prokaryotes have only one organelle, and ribosome, D, is wrong.

Therefore, choose: B.

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