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Question

Assertion :A cell membrane shows fluid behaviour. Reason: A membrane is a mosaic or composite of diverse lipids and proteins.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
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.
The cell membranes are composed primarily of two layers of phospholipid molecules with all the hydrophilic ends of phospholipids directed toward the inner and outer surfaces and the hydrophobic ends buried within the interior. These lipids exhibit lateral mobility and the integral membrane proteins can diffuse around in and at central lipid core. This gives membrane considerable degree of fluidity. Thus, the correct answer is option A.

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