EVERYDAY SCIENCE

Detailed explanation-1: -Nuclear membrane is absent in prokaryotic organisms. They do not contain a membrane bound nucleus and thus, their nucleus is called nucleoid. This a primitive adaptation. Eukaryotes contain membrane bound nucleus as well as membrane bound organisms.

Detailed explanation-2: -Prokaryotic cells, such as bacteria, have a free-floating chromosome that is usually circular and is not enclosed in a nuclear membrane. Instead, the DNA simply exists in a region of the cell called the nucleoid. Prokaryotic cells only have a small range of organelles, generally only a plasma membrane and ribosomes.

Detailed explanation-3: -Complete Answer: Nuclear membrane is absent in kingdom Monera because it lacks well-defined nucleus and other membrane bound cell organelles like mitochondria, Golgi apparatus and chloroplast.

Detailed explanation-4: -Prokaryotic cells are surrounded by a plasma membrane, but they have no internal membrane-bound organelles within their cytoplasm. The absence of a nucleus and other membrane-bound organelles differentiates prokaryotes from another class of organisms called eukaryotes.

Detailed explanation-5: -In prokaryotes, the DNA (chromosome) is in contact with the cellular cytoplasm and is not in a housed membrane-bound nucleus. In eukaryotes, however, the DNA takes the form of compact chromosomes separated from the rest of the cell by a nuclear membrane (also called a nuclear envelope).