Most common type of DNA is

Options

A. B DNA
B. Z DNA
C. A DNA
D. 1 & 2

Answer

**Step-by-Step Text Solution:**

1. **Understanding DNA Types**: DNA exists in several forms, but the most common type is the one that is predominantly found in living organisms.

2. **Identifying the Most Common Type**: The most common form of DNA is known as B-DNA. This form is characterized by its double helical structure.

3. **Structure of B-DNA**: B-DNA is a right-handed helix, which means that it twists in a clockwise direction. It has about 10 base pairs per turn and is the form of DNA that is most often found in cells under physiological conditions.

4. **Historical Context**: The double helical model of DNA was proposed by James Watson and Francis Crick in 1953, which provided a significant understanding of the molecular structure of DNA.

5. **Conclusion**: Therefore, the answer to the question "Most common type of DNA is" is B-DNA.

**Final Answer**: B-DNA

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