Which of the following is incorrect regarding receptors?

They have constant shape

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They are proteins

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The shape of receptors binding site changes to fit the messenger

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They are present in the cell membrane

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Solution

The correct option is A They have constant shape
Receptors are proteins that are embedded in the cell membrane with the binding site protruding outwards. They change the shape of the binding site to accommodate the incoming messenger and facilitate communication.
Hence, option (a) is correct answer.

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