Which of the following has cytoplasmic receptor
**Core Concept**
The question tests the understanding of steroid hormone receptors, which are a type of nuclear receptor. These receptors are intracellular, meaning they are found inside the cell, and they can affect gene expression by binding to specific DNA sequences.
**Why the Correct Answer is Right**
Steroid hormones, such as cortisol and aldosterone, bind to their respective receptors in the cytoplasm. The hormone-receptor complex then translocates to the nucleus, where it can influence gene transcription. This mechanism of action is characteristic of steroid hormones, which can diffuse across cell membranes due to their lipophilic nature.
**Why Each Wrong Option is Incorrect**
**Option A:** Insulin, a peptide hormone, binds to a receptor on the cell surface, triggering a cascade of intracellular signaling events.
**Option B:** Epinephrine acts through adrenergic receptors, which are G protein-coupled receptors on the cell surface.
**Option D:** Growth hormone also binds to a cell surface receptor, initiating signal transduction pathways.
**Clinical Pearl / High-Yield Fact**
Steroid hormones have a distinct mechanism of action compared to peptide hormones, and their ability to diffuse across cell membranes allows them to bind to intracellular receptors.
**Correct Answer: D. Steroid hormones have cytoplasmic receptors, but the answer provided is incomplete. Assuming the correct completion: Correct Answer: D. Steroid hormones.**