All bacteria have single circular chromosome per cell.

Answer

**Step-by-Step Solution:**

1. **Understanding the Statement**: The statement claims that all bacteria have a single circular chromosome per cell.

2. **Analyzing Chromosomal Structures**: While many bacteria do have a single circular chromosome (like E. coli), this is not true for all bacteria.

3. **Identifying Different Chromosomal Types**:
- **Single Circular Chromosome**: This is the most common type found in many bacteria, including E. coli.
- **Multicircular Chromosomes**: Some bacteria, like Brucella, have multiple circular chromosomes.
- **Linear Chromosomes**: Certain bacteria, such as Vibrio cholerae, possess linear chromosomes instead of circular ones.

4. **Conclusion**: Since there are various types of chromosomal structures in bacteria, the statement that "all bacteria have a single circular chromosome per cell" is false.

**Final Answer**: The statement is false.

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