Biology

The correct answer is: D.may be found embedded in the plasma membrane, or found within the cytoplasm or nucleus.

Explanation:

A.All work via protein kinases: This is incorrect. While some receptors (e.g., receptor tyrosine kinases) involve protein kinases in their signaling pathways, not all receptors do. For example, steroid hormone receptors function without involving kinases directly.

B.Are never found in the nucleus of a cell: This is incorrect. Some receptors, especially for hydrophobic or lipid-soluble molecules (like steroid hormones), are found inside the cell, often in the cytoplasm or nucleus, where they directly influence gene expres...