question_answer 31)

  The undefined nuclear region of prokaryotes are also known as (a) nucleus                          (b) nucleolus                      (c) nucleic acid                   (d) nucleoid

Answer:

  (d) The prokaryotic cells lack true nucleus and a circular DNA lies naked in the cytoplasm. The unidentified nuclear region of the cell is called nucleoid; the prokaryotic cell lacks chromosomes and nucleolus or nuclear membrane and nucleoplasm remains undifferentiated from the cytoplasm,