Actin filaments depolymerise and repolymerise in motile cells with

Options

A. `0*2-2*3` millisecond
B. `1*0-2*0` minutes
C. 1-2 hours
D. 2-3 days.

Answer

To answer the question regarding the time frame in which actin filaments depolymerize and repolymerize in motile cells, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding Actin Filaments**:
- Actin filaments are essential components of the cytoskeleton in eukaryotic cells. They play a crucial role in cell movement and shape.

2. **Process of Polymerization and Depolymerization**:
- Actin can exist in two forms: monomeric (G-actin) and filamentous (F-actin). The process of polymerization involves the assembly of G-actin into F-actin, while depolymerization is the disassembly of F-actin back into G-actin.

3. **Role of ATP**:
- The polymerization of actin is coupled with the hydrolysis of ATP to ADP. This energy-dependent process is critical for muscle contraction and cell motility.

4. **Time Frame for Depolymerization and Repolymerization**:
- In motile cells, actin filaments undergo rapid cycles of depolymerization and repolymerization. The transcript indicates that this process occurs within a very short time frame.

5. **Identifying the Correct Option**:
- The options provided are:
- 0.2 to 2.3 milliseconds
- 1 to 2 minutes
- 1 to 2 hours
- 2 to 3 days
- Based on the information from the transcript, the correct time frame for actin filament dynamics is **0.2 to 2.3 milliseconds**.

6. **Conclusion**:
- Therefore, the correct answer to the question is option number one: **0.2 to 2.3 milliseconds**.