Bacteria with group of flagella on both sides are

Options

A. Amphitrichous
B. Cephalotrichous
C. Peritrichous
D. Lophotrichous.

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about bacteria that have a group of flagella located on both sides of the cell.

2. **Classification of Bacteria Based on Flagella**: Bacteria can be classified according to the number and arrangement of their flagella. The main types include:
- **Atrichous**: No flagella.
- **Monotrichous**: A single flagellum at one end.
- **Lophotrichous**: A tuft of flagella at one or both ends.
- **Amphitrichous**: One flagellum at each end.
- **Peritrichous**: Flagella distributed all around the cell.
- **Cephalotrichous**: A tuft of flagella at one end.

3. **Identifying the Correct Type**: Since the question specifies a "group of flagella on both sides," we need to identify which classification fits this description.
- **Lophotrichous** refers to a tuft of flagella at one end, which does not fit.
- **Amphitrichous** refers to one flagellum at each end, which also does not fit.
- **Peritrichous** refers to flagella all around the cell, which is not what we are looking for.

4. **Conclusion**: The correct classification for bacteria that have a group of flagella on both sides is **Lophotrichous**. However, since the question specifies "both sides," it may also imply **Amphitrichous** as it has flagella at both ends.

5. **Final Answer**: The bacteria with a group of flagella on both sides are called **Amphitrichous**.