The fuild nature of cell membrane is helpful in functions like:
(A) formation of intercellular juctions
(B) Cell growth
(C) Cell division
(D) DNA replication
(E) Secretion
(F) Ribosome synthesis

Answer

To answer the question regarding the functions that the fluid nature of the cell membrane is helpful for, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Fluid Nature of Cell Membrane**:
- The cell membrane is described by the fluid mosaic model, which indicates that it is composed of a variety of lipids, proteins, and carbohydrates that can move laterally within the layer. This fluidity is essential for various cellular functions.

2. **Option (A): Formation of Intercellular Junctions**:
- The fluid nature of the cell membrane allows cells to interact and recognize each other, which is crucial for forming intercellular junctions. Thus, this option is correct.

3. **Option (B): Cell Growth**:
- The cell membrane's fluidity facilitates the import and export of large molecules through processes like endocytosis and exocytosis. These processes are vital for cell growth. Therefore, this option is also correct.

4. **Option (C): Cell Division**:
- Similar to cell growth, the fluid nature of the membrane aids in the processes necessary for cell division, allowing the cell to reorganize and separate into two daughter cells. Hence, this option is correct.

5. **Option (D): DNA Replication**:
- The fluidity of the membrane can influence the activation of proteins involved in DNA replication. For example, certain domains within the membrane can activate initiator proteins necessary for DNA replication. Thus, this option is correct.

6. **Option (E): Secretion**:
- The selectively permeable nature of the cell membrane allows for the regulated secretion of materials. This is facilitated by the fluidity of the membrane, making this option correct as well.

7. **Option (F): Ribosome Synthesis**:
- The cell membrane plays a role in signal transduction, which can influence ribosome synthesis. Therefore, the fluid nature of the membrane is also helpful for this function, making this option correct.

### Conclusion:
All options (A, B, C, D, E, F) are correct as the fluid nature of the cell membrane supports each of these functions.