Question

The organisms lacking nuclear membrane and cell organelles is called as
A.Prokaryotes
B.Eukaryotes
C.Protozoa
D.Virus

Answer 1

Nuclear membrane compartmentalizes nucleus and cytoplasm in a cell. Cells having nuclear membrane have well defined nuclei.

Complete step by step answer:
Prokaryote is a simple, single-celled organism that lacks a nucleus It typically consists of a single large loop called a circular chromosome. The nucleoid and some other frequently seen features of prokaryotes are shown in the diagram below of a cut-away of a rod-shaped bacterium.Most bacteria are, however, surrounded by a rigid cell wall made out of peptidoglycan, a polymer composed of linked carbohydrates and small proteins.
The cell wall provides an extra layer of protection, helps the cell maintain its shape, and prevents dehydration. Many bacteria also have an outermost layer of carbohydrates called the capsule. The capsule is sticky and helps the cell attach to surfaces in its environment.
The small size of prokaryotes allows ions and organic molecules that enter them to quickly spread to other parts of the cell.
Similarly, any wastes produced within a prokaryotic cell can quickly move out.
DNA is surrounded by a membrane), and has other membrane-bound organelles that allow for compartmentalization of functions.
As a cell becomes larger, it becomes more and more difficult for the cell to acquire sufficient materials to support the processes inside the cell.
Because the relative size of the surface area through which materials must be transported declines.In general, cell size is limited because volume increases much more quickly than does cell surface area.

Hence option A is correct.

Note:
Prokaryotes are predominantly single-celled organisms of the domains Bacteria and Archaea. All prokaryotes have plasma membranes, cytoplasm, ribosomes, a cell wall, DNA, and lack membrane-bound organelles. Many also have polysaccharide capsules.