All the following are characteristics of the plasma membrane except:

A. It serves as a selective transpo route through the facilitation of both active and passive transpo.

B. It possesses a thickness of 1 to 2 mm.

C. It is involved in the generation of ionic gradients between the cytoplasm and the external environment.

D. It serves as a sensor of signals from the extracellular environment.

Correct Answer: It possesses a thickness of 1 to 2 mm.

Description: Plasma membrane of eukaryotic cells has a thickness of about 5 nm, constituted by lipid bilayer and embedded proteins. Hence, option B is the answer. It is selective for the transpo of substances into or out of the cells - for active as well as passive transpos It consists of Na+-K+ pump. It causes active transpo of sodium out of the cell and that of potassium into the cell. Thus, ionic gradients are established. Option C is a correct statement. Proteins - Integral proteins (sensors for signals from the external environment) and peripheral proteins.

Category: Physiology

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