A eukaryotic cell has
(a) Single chromatin fiber
(b) Definite nucleus
(c) Incipient nucleus
(d) None of these

Options

A. Single chromatin fiber
B. Definite nucleus
C. Incipient nucleus
D. None of these

Answer

To solve the question regarding the characteristics of a eukaryotic cell, let's analyze each option step by step:

1. **Understanding Eukaryotic Cells**: Eukaryotic cells are characterized by having a defined nucleus. This is a key feature that distinguishes them from prokaryotic cells, which do not have a true nucleus.

2. **Evaluating the Options**:
- **Option (a): Single chromatin fiber**: This is not a defining characteristic of eukaryotic cells. Eukaryotic cells can have multiple chromatin fibers, especially during cell division.
- **Option (b): Definite nucleus**: This is true. Eukaryotic cells have a definite nucleus that is enclosed by a nuclear membrane, which contains the cell's genetic material (DNA).
- **Option (c): Incipient nucleus**: This term is not typically used to describe eukaryotic cells. An incipient nucleus suggests an early or developing stage, which does not apply to the definition of a eukaryotic cell.
- **Option (d): None of these**: Since option (b) is correct, this option is not applicable.

3. **Conclusion**: Based on the evaluation, the correct answer is **(b) Definite nucleus**. This option accurately reflects a fundamental characteristic of eukaryotic cells.