Plasma Membrane Incorrect Statement Analysis
The question requires identifying the INCORRECT statement concerning the plasma membrane.
- Statement 1: It is outermost covering of the cell - Correct for animal cells.
- Statement 2: Plasma membrane is made up of lipid and protein - Correct. It's a lipid bilayer embedded with proteins.
- Statement 3: It is selectively permeable - Correct. This is a primary function, controlling substance passage.
- Statement 4: It is rigid in nature - This statement is INCORRECT.
The plasma membrane is known for its fluidity, allowing components to move laterally. This characteristic is central to the fluid mosaic model. Rigidity is typically associated with structures like the cell wall, not the plasma membrane.
Therefore, the incorrect assertion about the plasma membrane is that it is rigid.
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