If DNA has 10 spirals, the length of DNA will be

Options

A. 34Å
B. 340Å
C. 640Å
D. 64Å

Answer

To solve the question regarding the length of DNA with 10 spirals, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of DNA**:
- DNA is structured as a double helix, which consists of two spirals. Each complete turn of the helix is referred to as a spiral.

2. **Identify the Length of One Complete Turn**:
- According to the information provided, one complete turn (or spiral) of DNA is approximately 34 angstroms in length.

3. **Calculate the Length for 10 Spirals**:
- If one spiral is 34 angstroms long, then for 10 spirals, we need to multiply the length of one spiral by 10.
- Calculation:
\[ \text{Length of DNA} = 10 \text{ spirals} \times 34 \text{ angstroms/spiral} = 340 \text{ angstroms} \]

4. **Final Answer**:
- The total length of DNA with 10 spirals is 340 angstroms.

### Conclusion:
The length of DNA with 10 spirals is **340 angstroms**.

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