Which of the following is enucleated

Options

A. (a) Squamous epithelial cell
B. (b) Mature human erythrocyte
C. (c) Mature human leukocyte
D. (d) Mature frog erythrocyte

Answer

To determine which of the following options is enucleated, we need to analyze each option to see if it contains a nucleus or not.

1. **Option A: Squamous Epithelial Cell**
- Squamous epithelial cells are part of the epithelial tissue and are known to have a nucleus. They are involved in functions such as diffusion and filtration. Therefore, this option is not enucleated.

2. **Option B: Mature Human Erythrocyte (Red Blood Cell)**
- Mature human erythrocytes are known to be enucleated. During their maturation, they lose their nucleus to maximize space for hemoglobin, which is essential for oxygen transport. Thus, this option is indeed enucleated and is the correct answer.

3. **Option C: Mature Human Leukocyte (White Blood Cell)**
- Mature human leukocytes contain a nucleus. These cells are crucial for the immune response and thus have a nucleus to perform their functions. Therefore, this option is not enucleated.

4. **Option D: Mature Frog Erythrocyte**
- Unlike human erythrocytes, mature frog erythrocytes (from amphibians) retain their nucleus. Therefore, this option is also not enucleated.

Based on the analysis above, the only enucleated cell among the options provided is:

**Correct Answer: Option B - Mature Human Erythrocyte**