Which process explains how steroid hormone signaling can produce long-lasting cellular effects?

• A. The receptor remains on the membrane and triggers quick changes.
• B. The signaling relies exclusively on ion channels.
• C. The hormone receptor complex acts as a transcription factor entering the nucleus to alter gene expression.
• D. The hormone is degraded rapidly in the cytoplasm.

Answer: (C)

Steroid hormones produce long-lasting cellular effects because they diffuse into the cell and bind to intracellular receptors. The hormone–receptor complex then acts as a transcription factor that enters the nucleus and alters which genes are transcribed. This changes the levels of specific mRNA and, subsequently, the proteins produced, reshaping cellular function over time. Because these effects rely on new gene expression and protein synthesis, they unfold over hours to days and can persist after the hormone signal diminishes.

In contrast, signaling through membrane receptors or ion channels tends to trigger rapid, short-lived responses that do not involve broad changes in gene expression. Rapid degradation of the hormone would also limit effects unless transcriptional changes had already been initiated by a prior signal.