The undefined nuclear region of prokaryotes are also known as
(a) nucleus
(b) nucleolus
(c) nucleic acid
(d) nucleoid
Explanation: In prokaryotic cells, there is no well-defined nucleus or nuclear membrane to enclose the genetic material. The genetic material consists of circular DNA that lies freely in the cytoplasm, and this area is referred to as the nucleoid. Hence, (d) is the correct option.