There are no complex organelles, but these complex organelles can carry out some physiological activities and processes. For example, most prokaryotes can carry out aerobic respiration because they contain enzymes related to aerobic respiration, which are mainly located in the cytoplasm matrix, and some enzymes are located on the cell membrane, so some chemical reactions are also carried out on the inner surface of the cell membrane.

Prokaryotes that carry out photosynthesis, such as cyanobacteria, have photosynthetic pigments and enzymes related to photosynthesis.