Which of the following features is common to prokaryotes and many eukaryotes

Options

A. (a) Chromosomes present
B. (b) Cell wall present
C. (c) Nuclear membrane present
D. (d) Sub cellular organelles present

Answer

To solve the question "Which of the following features is common to prokaryotes and many eukaryotes?", we can follow these steps:

### Step 1: Understand the Definitions
- **Prokaryotes**: These are organisms that lack a well-defined nucleus and membrane-bound organelles. Examples include bacteria and archaea.
- **Eukaryotes**: These organisms have a well-defined nucleus and membrane-bound organelles. Examples include plants, animals, fungi, and protists.

### Step 2: Analyze the Options
We need to evaluate each option to see which feature is common to both prokaryotes and many eukaryotes.

1. **Option A: Chromosomes**
- Chromosomes are structures that carry genetic material (DNA). Both prokaryotes and eukaryotes have DNA, although the structure and organization may differ. Prokaryotes typically have a single circular chromosome, while eukaryotes have multiple linear chromosomes.

2. **Option B: Cell Wall**
- The cell wall is present in many prokaryotes (like bacteria) and in some eukaryotes (like plants and fungi). However, it is absent in animal cells, making this feature not universally common.

3. **Option C: Nuclear Membrane**
- Prokaryotes do not have a nuclear membrane because they lack a defined nucleus. Eukaryotes do have a nuclear membrane, so this feature is not common.

4. **Option D: Subcellular Organelles**
- Prokaryotes do not have membrane-bound organelles, while eukaryotes do. Therefore, this feature is also not common.

### Step 3: Conclusion
After analyzing all the options, we find that the only feature that is common to both prokaryotes and many eukaryotes is **chromosomes**. Thus, the correct answer is:

**Answer: A. Chromosomes**

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