Select the correct statements regarding cell membrane in eukaryotic cell. A. Membrane of human RBCs has approximately 52\% protein. B. Major phospholipids are arranged in a bilayer. C. Extensions of the plasma membrane into the cell form mesosomes. D. Tails towards the inner part of lipids are hydrophobic and thus protected from aqueous medium. E. Glycocalyx is present on the outer surface of the plasma membrane. Choose the correct answer from the options given below :
C. A, B and D only
Statement A is correct. Chemical studies on human red blood cells (RBCs) show that the cell membrane consists of approximately 52\% protein and 40\% lipids. Statement B is correct. The cell membrane is mainly composed of lipids, primarily phospholipids, which are arranged in a bilayer. Statement C is incorrect. Mesosomes are formed by the extensions of the plasma membrane into the cell in prokaryotes, not in eukaryotic cells. Statement D is correct. The lipids are arranged within the membrane with the polar hydrophilic heads towards the outer sides and the non-polar hydrophobic tails towards the inner part, ensuring that the non-polar tail of saturated hydrocarbons is protected from the aqueous environment. Since statement C is incorrect for eukaryotic cells, any option containing C is eliminated. Thus, statements A, B, and D are the correct choices. Answer: A, B and D only
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