Which of the following constitutes biological membrane?

Phosphoprotein

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Protein and phospholipid

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Phospholipid

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Cellulose

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Solution

The correct option is A Protein and phospholipid
Plasma membrane is the common outer covering of all the cell and composed of a bilayer of phospholipids with the phosphate groups on the surface and lipids embedded inside the membrane not exposed to the surface. Also, several proteins are interspersed in the membrane like a mosaic. Integral membrane proteins traverse the entire width of the membrane while surface proteins are present only on the surface. Thus, the correct answer is option B.

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