In a human cell 2.2 meter long thread of DNA distributed in :-

Options

A. one chromosome
B. 23 chromosome
C. X chromosome
D. 46 chromosome

Answer

To solve the question regarding the distribution of the 2.2 meter long thread of DNA in a human cell, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Total Length of DNA**:
- In a human cell, the total length of DNA is approximately 2.2 meters. This DNA is not found as a single continuous thread but is organized in a specific manner.

**Hint**: Remember that DNA is packaged into structures called chromosomes.

2. **Chromosomes in Humans**:
- Humans have a total of 46 chromosomes, which are organized into 23 pairs. This means that each human cell contains two sets of chromosomes (one from each parent).

**Hint**: Think about how many chromosomes are present in a diploid organism like humans.

3. **Chromatin Structure**:
- The DNA in chromosomes is in the form of chromatin, which is a complex of DNA and proteins. When chromosomes are unwound, the DNA can be visualized as a long thread.

**Hint**: Consider how DNA is structured in the nucleus of the cell.

4. **Distribution of DNA**:
- The total length of 2.2 meters of DNA is distributed across these 46 chromosomes. If we consider only one set of chromosomes (haploid), the length would be approximately half, which is around 1.1 meters.

**Hint**: Reflect on the difference between diploid and haploid sets of chromosomes.

5. **Conclusion**:
- Therefore, the 2.2 meter long thread of DNA is distributed in 46 chromosomes in a human cell.

**Hint**: Summarize the information about chromosome number and DNA length to arrive at the final answer.

### Final Answer:
The 2.2 meter long thread of DNA in a human cell is distributed in **46 chromosomes**.