Final answer:
If a steroid hormone receptor complex could not enter the nucleus, it would disrupt the cell's activities.
Step-by-step explanation:
If a steroid hormone receptor complex could not enter the nucleus, it would have a significant impact on the cell's activities. Steroid hormones regulate gene expression by binding to intracellular receptors in the cytoplasm or nucleus, forming a hormone-receptor complex. This complex then moves to the nucleus, where it affects the transcription of specific genes. If the complex cannot enter the nucleus, it would not be able to regulate gene expression and the cell's activities would be disrupted.