You Strip Off All Proteins on the Cell Surface by Using

question 31

Multiple Choice

You strip off all proteins on the cell surface by using a protease (an enzyme that destroys proteins) . Now, when you add a specific signaling molecule, the cell still responds. Why is this?

• A)The signaling molecule doesn't need a receptor.
• B)The signaling molecule is polar and can diffuse into the cell.
• C)The receptor is in the interior of the cell.
• D)The signaling molecule is nonpolar and binds a cell-surface receptor.

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