Question

The nucleus is separated from the cytoplasm by ...........which is absent in .......... and present only in ......... The words filling the blanks are respectively
A. Cell wall. Bacteria and Amoeba
B. Cell membrane, animals and prokaryotes
C. Nuclear membrane, prokaryotes, and eukaryotes
D. Plasma membrane, eukaryotes, and prokaryotes

Answer 1

Hint: Prokaryotic cell and eukaryotic cell and different organ organisation in their body. In prokaryotes many of the organelles are absent which are present in eukaryotes.

Complete answer:
The main difference between prokaryotes and eukaryotes is with the nucleus. in prokaryotes there is no boundary between the nucleus and cytoplasm.The nucleus of prokaryotes cell is floating inside the cytoplasm while the nucleus of eukaryotic cell is bounded by the nuclear membrane.
A nuclear membrane is a double membrane that surrounds the nucleus of a cell. Its purpose is to keep the chromosomes separate from the rest of the cell. The nuclear membrane contains a network of small holes or pores that allow certain materials, such as nucleic acids and proteins, to pass between the nucleus and the cytoplasm.
The nuclear envelope is a double membrane that separates the nucleus from the cytoplasm of a cell. A nucleus is not found in prokaryotes. The DNA is concentrated in a small area of the cell known as the nucleoid region.The nuclear envelope separates the cytoplasm from the organelles and nucleus of a eukaryotic cell.

Thus, the correct answer is option C i.e, Nuclear membrane, prokaryotes, and eukaryotes.

Note: The main difference between prokaryotes and eukaryotes cells is that the organelles in eukaryotes are bound by the membrane, whereas the organelles (primarily the nucleus) in prokaryotes are free, hence the term false nucleus.