Question

All below are accepted functions of the plasma membrane except:

Option 1: Selective permeability
Option 2: Cell signaling
Option 3: Energy production
Option 4: Cell adhesion

Answer 1

The function not associated with the plasma membrane is energy production. While selective permeability, cell signaling, and cell adhesion are key functions of the plasma membrane, energy production occurs in the mitochondria, not the plasma membrane.

Step-by-step explanation:

All below are accepted functions of the plasma membrane except:

1. Selective permeability
2. Cell signaling
3. Energy production
4. Cell adhesion

The correct answer to this question is option 3: Energy production. The primary functions of the plasma membrane include selective permeability, allowing certain substances to enter and leave the cell while blocking others; cell signaling, where the membrane's receptors interact with external molecules to transmit signals into the cell; and cell adhesion, which is crucial for cells to bind together forming tissues and communicate with one another.

However, energy production is not a function of the plasma membrane. This process primarily occurs in the mitochondria within eukaryotic cells, where ATP synthesis takes place. The plasma membrane's role does involve some energy-related processes, such as active transport, which requires energy to move substances against their concentration gradient. But the actual production of energy is not a function of the plasma membrane itself.