DNA involved in forming structural genes it

Options

A. Less than 1%
B. About 10%
C. 0.33
D. About 50%

Answer

To solve the question regarding the percentage of DNA involved in forming structural genes, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Structural Genes**:
- Structural genes are segments of DNA that code for RNA or proteins. They are essential for the synthesis of proteins that perform various functions in the body.

2. **Identifying the Role of Structural Genes**:
- Unlike regulatory genes, which control the expression of other genes, structural genes directly code for the proteins or RNA products that carry out cellular functions.

3. **Percentage of DNA in Structural Genes**:
- It is noted that structural genes make up a small fraction of the total DNA in an organism. The question provides several options regarding the percentage of DNA that constitutes structural genes.

4. **Analyzing the Options**:
- The options given are:
- Less than 1%
- About 10%
- 0.33%
- About 50%
- Based on biological understanding, structural genes are known to represent a very small portion of the entire genomic DNA.

5. **Conclusion**:
- The correct answer is “less than 1%” of the total DNA is involved in forming structural genes. This aligns with the understanding that most of the DNA does not code for proteins but may have other functions, including regulatory roles.

### Final Answer:
The percentage of DNA involved in forming structural genes is **less than 1%**.

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