The cells having well - organized nucleus with a nuclear membrane are designated as

Correct option is B

The correct answer is (b) eukaryotic cells.
Eukaryotic cells are cells that have a well-organized nucleus with a nuclear membrane. The nuclear membrane separates the genetic material from the rest of the cell. This allows the genetic material to be protected and organized. Eukaryotic cells also have other membrane-bound organelles, such as the mitochondria, endoplasmic reticulum, and Golgi apparatus.
Here's a more detailed explanation of the options:
· Prokaryotic cells: Prokaryotic cells are cells that lack a true nucleus and other membrane-bound organelles. Instead, their genetic material (DNA) is located in the nucleoid region, which is not enclosed by a nuclear membrane. Prokaryotic cells are found in organisms such as bacteria and archaea.
· Cheek cells: Cheek cells refer to the cells that line the inside of your cheek. These cells are eukaryotic cells because they have a well-organized nucleus with a nuclear membrane.