Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion A cell membrane shows fluid behavior. Reason A membrane is a mosaic or composite of diverse lipids and proteins.A) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion, then mark
B) If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion, then mark
C) If Assertion is true statement but Reason is false, then mark
D) If both Assertion and Reason are false statements, then mark
Correct Answer: A
Solution :
With the help of freeze-fracture techniques in electron microscopy, the fluid mosaic model was put forward in 1970 by S J Singer and G L Nicolson. According to this model, plasma membrane is composed of phospholipids, extrinsic proteins (peripheral proteins) and intrinsic proteins (integral proteins). Selective permeability of plasma membrane can be explained with this model. Hence, assertion and reason both are true.
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