Assertion :Plasma membrane is trilaminar. Reason: One optically light layer is lipids and on both sides of it two optically dense layers of protein are present.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
In the year 1960, Robertson proposed the unit membrane concept for the model of plasma membrane. According to this model, the plasma membrane has a trilaminar structure. There is a lipid bilayer surrounded on either side by an optically dense layer of proteins with a difference in type for the outer and inner side.
Thus, the correct answer is option A.

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