Which of the following is not a character of prokaryote :-

Options

A. Lack of well organized nucleus
B. Presence of 70 s ribosome
C. Presence of E.R
D. Presence of plasmamembrane

Answer

To determine which of the following is not a character of prokaryotes, we will analyze each option provided:

1. **Lack of well-organized nucleus**:
- Prokaryotes do not have a well-defined nucleus. Instead, their genetic material is located in a region called the nucleoid, which is not membrane-bound.
- Therefore, this option is a characteristic of prokaryotes.

2. **Presence of 70S ribosome**:
- Prokaryotes contain 70S ribosomes, which are composed of 50S and 30S subunits. This is a key feature of prokaryotic cells.
- Thus, this option is also a characteristic of prokaryotes.

3. **Presence of endoplasmic reticulum**:
- The endoplasmic reticulum (ER) is an organelle found in eukaryotic cells and is involved in protein synthesis and processing. Prokaryotes do not possess an endoplasmic reticulum.
- Therefore, this option is NOT a characteristic of prokaryotes.

4. **Presence of the plasma membrane**:
- Prokaryotes have a plasma membrane that surrounds the cell and regulates the movement of substances in and out of the cell.
- Hence, this option is a characteristic of prokaryotes.

Based on the analysis, the correct answer is that the presence of endoplasmic reticulum is NOT a character of prokaryotes.

### Summary:
- The option that is not a characteristic of prokaryotes is **Presence of endoplasmic reticulum**.