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Q.

Which of the following is not a constituent of the plasma membrane?

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a

Carbohydrates

b

Lignin

c

Phospholipids

d

Cholesterol

answer is D.

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Detailed Solution

The correct answer is Lignin.

Phospholipids are the class of lipids that are present in the plasma membrane. 

Cholesterol is present in the plasma membrane and provides structural support to the membrane.

Carbohydrates are present on the surface of cells and are bound either to proteins or to lipids.

Lignin is not present in the plasma membrane. 

 

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