Q: Which type of hormones are insoluble in lipids?  

Answer: D

The hormones that are insoluble in lipids include amino acid derivative hormones (such as epinephrine and norepinephrine), peptide hormones (such as insulin and glucagon), and proteinaceous hormones (such as growth hormone and prolactin). Lipid insolubility of hormones is important because it determines how hormones interact with their receptors on target cells. Insoluble hormones cannot diffuse across the plasma membrane and therefore must bind to receptors on the surface of the target cell. This binding triggers a signaling cascade that ultimately leads to a physiological response.

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