Question

The plasma membrane consists of.
A. protein embedded in phospholipid bilayer.
B. protein embedded in a polymer of glucose molecules.
C. protein embedded in carbohydrate bilayer.
D. phospholipids embedded in a protein bilayer.

Answer 1

Hint: Plasma membrane is the outermost covering of the animal cells, which maintain the transportation of molecules through in it by the help of several protein channels. Membrane proteins are present inside the surface of membrane, outside the surface of membrane and embedded in membrane.

Complete answer:
A plasma membrane is known as a cell membrane which is a lipid bilayer structure, that is the basic component of the cell membrane. It is a semi-permeable membrane that encloses cytoplasm and nucleoplasm. This plasma membrane is composed of lipid bilayer with cholesterol which present in between phospholipids that maintain fluidity, and also bear integral protein molecules that act as membrane transporter and peripheral protein present outer side act as enzyme shaping the cells and organelles.
Plasma membrane is a two layer structure in which the hydrocarbon chain of two fatty acids function as a hydrophobic nonpolar tail and the phosphate and additional group behave as a hydrophilic polar head group of molecule.
Cell membranes show a number of function or cellular processes such as ion conductivity, cell adhesion and cell signaling.
B. protein embedded in a polymer of glucose molecule:- that type of composition form glycoprotein which is mainly composed of oligosaccharides chain that are covalently bound to amino acid side chain and it form by process known as glycosylation which is post translational modification process.
 Protein embedded in carbohydrate bilayer and phospholipids embedded in a protein bilayer, there is not such kind of layer, structure or molecule composition that exists in nature.

Hence, the correct answer is option A.

Note: plasma membrane is the outermost covering of animal cells but in case of plant cells it lies just beneath the cell wall, cell wall provides rigidity and protection to the plant cell. Plasma membranes are semipermeable in nature but cells are impermeable in nature.