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Cilia and flagella both have....

Cilia and flagella both have.

A

9+2 arrangement

B

9+0 arrangement

C

symmetrical beats

D

`100mum` length

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Identify Cilia and Flagella**: - Cilia and flagella are both extensions of the cell membrane. They are structures that protrude from the surface of cells. 2. **Differentiate Between Cilia and Flagella**: - Cilia are shorter and often function like oars, moving in a coordinated manner to propel the cell or move substances along the surface. - Flagella are longer and typically function to propel the entire cell in a whip-like motion. 3. **Understand the Structure**: - Both cilia and flagella contain a core structure known as the axoneme. 4. **Describe the Axoneme Structure**: - The axoneme is characterized by a specific arrangement of microtubules. It consists of: - **9 pairs of doublet microtubules** arranged around the periphery. - **1 pair of centrally located microtubules**. 5. **Conclude with the Arrangement**: - The overall arrangement of microtubules in cilia and flagella is referred to as the "9 + 2" arrangement, which indicates 9 doublets surrounding 2 central microtubules. 6. **Final Answer**: - Therefore, the correct answer to the question is that cilia and flagella both have a **9 + 2 arrangement**.
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