The major functions of the plasma membrane do not include:

Options

A. separation of the fluid environments inside and outside the cell
B. regulation of molecules and ions that pass into and out of the cell
C. recognition and communication between different cells and tissues
D. production of proteins used in construction of the cell wall

Explanation

To determine which function is not a major function of the plasma membrane, we can analyze each of the provided options step by step:

1. **Separation of Fluid Environments**: The plasma membrane serves as a barrier that separates the internal environment of the cell from the external environment. This is a fundamental function of the plasma membrane, allowing the cell to maintain homeostasis.

**Hint**: Think about how the plasma membrane acts like a boundary for the cell.

2. **Regulation of Molecules and Ions**: The plasma membrane is selectively permeable, meaning it regulates what molecules and ions can enter and exit the cell. This regulation is crucial for maintaining the cell's internal conditions.

**Hint**: Consider how the cell controls the substances that come in and out.

3. **Recognition and Communication**: The plasma membrane contains proteins that play a role in cell recognition and communication. This is important for the interaction between different cells and tissues, allowing them to coordinate their functions.

**Hint**: Reflect on how cells need to communicate with each other to function properly.

4. **Production of Proteins for Cell Wall Construction**: While the plasma membrane is involved in various functions, it is not responsible for the production of proteins used in constructing the cell wall. This function is typically associated with the endoplasmic reticulum and ribosomes, not the plasma membrane itself.

**Hint**: Think about where proteins are actually synthesized in a cell.

After analyzing all the options, we conclude that the major function of the plasma membrane does not include the production of proteins used in the construction of the cell wall. Therefore, the correct answer is:

**Answer**: Production of proteins used in the construction of the cell wall.

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