Every cell present in the body of a human being has a dense central core called the _____.
a) Nucleus
b) Nucleolus
c) Nucleoplasm
d) Chromosomes

Options

A. Nucleus
B. Nucleolus
C. Nucleoplasm
D. Chromosomes

Answer

To solve the question "Every cell present in the body of a human being has a dense central core called the _____," we need to analyze the options provided:

1. **Understanding the Options**:
- **a) Nucleus**: This is a dense structure found in the center of the cell that contains genetic material and is responsible for controlling the cell's activities.
- **b) Nucleolus**: This is a small, dense structure within the nucleus, but it is not the central core of the cell.
- **c) Nucleoplasm**: This is the fluid that fills the nucleus, but it is not the dense core itself.
- **d) Chromosomes**: These are structures made of DNA that carry genetic information, but they are not the core of the cell.

2. **Identifying the Correct Answer**:
- The nucleus is the part of the cell that serves as the dense central core. It is where most of the cell's genetic material is stored and where many metabolic activities occur.

3. **Conclusion**:
- Therefore, the correct answer to the question is **a) Nucleus**.

### Step-by-Step Text Solution:
1. Read the question carefully to understand what is being asked.
2. Analyze each option provided:
- Option a) Nucleus: Central core of the cell.
- Option b) Nucleolus: Structure within the nucleus.
- Option c) Nucleoplasm: Fluid inside the nucleus.
- Option d) Chromosomes: Genetic material, not the core.
3. Determine which option best fits the description of a "dense central core."
4. Conclude that the answer is **a) Nucleus**.