Adenosine triphosphate(ATP) powers the movement of cilia and flagella. Adenosine triphosphate activity is present in

Options

A. Nexin protein
B. Dynein protein
C. Massule
D. Both (1) and(2)

Answer

To answer the question regarding where adenosine triphosphate (ATP) activity is present in relation to the movement of cilia and flagella, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding ATP's Role**: ATP (adenosine triphosphate) is a molecule that provides energy for various cellular processes, including the movement of cilia and flagella.

2. **Identifying Key Proteins**: In cilia and flagella, several proteins are involved in their movement. The main proteins to consider are:
- Nexine
- Dynein
- Massacule

3. **Evaluating Nexine Protein**:
- Nexine is a protein found in cilia and flagella.
- Its role is to connect microtubules and prevent them from sliding past each other.
- However, it does not hydrolyze ATP or directly facilitate movement. Therefore, this option is incorrect.

4. **Evaluating Dynein Protein**:
- Dynein is a motor protein that plays a crucial role in the movement of cilia and flagella.
- It utilizes the energy released from the hydrolysis of ATP to facilitate the sliding of microtubules, which leads to movement.
- Since dynein is directly involved in ATP hydrolysis and movement, this option is correct.

5. **Evaluating Massacule**:
- The massacule is a component of the centriole and is involved in the formation of new centrioles.
- It does not play a role in the movement of cilia and flagella, making this option incorrect as well.

6. **Conclusion**: Based on the evaluations, the correct answer is that adenosine triphosphate (ATP) activity is present in the dynein protein of cilia and flagella.

### Final Answer:
Adenosine triphosphate (ATP) activity is present in the dynein protein of cilia and flagella.

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