Why is nuclear region in prokaryotes poorly defined?

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Solution

In prokaryotic cells, nucleus is not defined properly because, it is not surrounded by nuclear membrane, with inner nucleoplasm and chromatin material. So, it is poorly defined and it is called nucleoid or genophore.

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Why prokaryotes don't have a nuclear membrane

Question 13
The undefined nuclear region of prokaryotes is also known as

(a) nucleus
(b) nucleolus
(c) nucleic acid
(d) nucleoid

Fill in the gaps in the following table illustrating differences between prokaryotic and eukaryotic cells.

	Prokaryotic cell		Eukaryotic cell
1.	Size: generally small ( 1-10 µm) 1 µm== 10^-6 m	1.	Size: generally large (5-100 µm)
2.	Nuclear region: _____________________________ and is known as ________.	2.	Nuclear region: well-defined and surrounded by a nuclear membrane
3.	Chromosome: single	3.	More than one chromosome
4.	Membrane-bound cell organelles are absent	4.	________________________________________________________________________________________________

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