Question

The incorrect statement about plasma membrane is

• A. It serves as a selectively permeable barrier to the external environment.
• B. It serves as a mediator between the internal and external environments.
• C. In Eukaryotas, it contains the cytochrome chain of oxidative phosphorylation.
• D. It contains phospholipids as a structural component.
• E. It contains proteins that in some cases span the membrane.

Answer 1

The correct option is C In Eukaryotas, it contains the cytochrome chain of oxidative phosphorylation.

The plasma membrane is present in both eukaryotic and prokaryotic cell and forms a barrier between the inner and outer surface of the cell and regulates the flow of the substance into it. The plasma membrane is composed of a phospholipids bilayer with embedded proteins. The specific membrane proteins account for the selective permeability of the membrane and passive and active transport mechanisms. Further, the mitochondria and chloroplasts in the eukaryotic cell facilitate the synthesis of ATP through chemiosmosis.