Read the following satements and select the correct option.
Loosely packed and light stained region of chromation are called as heterochromatin.
(ii) Densely packed and dark stained region of chromatin are called as euchromatin.
(iii) A typical nucleosome contains 200 bp of DNA helix.

Options

A. Statements (i) and (ii) are true , but statement (iii) is false.
B. Statement (i) and (ii) are false, but statement (iii) is true.
C. Statement (ii) and (iii) are true , but statement (i) is false.
D. All the statements are true.

Explanation

To solve the question, we need to analyze each of the three statements provided and determine their accuracy based on our understanding of chromatin structure.

### Step-by-Step Solution:

1. **Understanding Chromatin Structure**:
- Chromatin is composed of DNA and proteins (histones) and is found in the nucleus of eukaryotic cells. It can be classified into two main types: euchromatin and heterochromatin.

2. **Evaluating Statement 1**:
- The first statement claims that "loosely packed and light stained region of chromatin are called as heterochromatin."
- This statement is **false**. Loosely packed and light-stained regions of chromatin are known as **euchromatin**, which is transcriptionally active.

3. **Evaluating Statement 2**:
- The second statement claims that "densely packed and dark stained region of chromatin are called as euchromatin."
- This statement is also **false**. Densely packed and dark-stained regions are referred to as **heterochromatin**, which is transcriptionally inactive.

4. **Evaluating Statement 3**:
- The third statement states that "a typical nucleosome contains 200 bp of DNA helix."
- This statement is **true**. A nucleosome typically consists of about 200 base pairs of DNA wrapped around a histone octamer.

5. **Conclusion**:
- Based on the evaluations:
- Statement 1: False
- Statement 2: False
- Statement 3: True
- Therefore, the correct option is that statement 1 and 2 are false, but statement 3 is true.

### Final Answer:
The correct option is: **Statement 1 and 2 are false, but statement 3 is true.**

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