Which of the following best describes how transcriptional regulators work in combination with other proteins to control gene expression?

• A. Transcriptional regulators work together with other proteins to increase binding affinity and control gene expression.
• B. Transcriptional regulators decrease the binding affinity of other proteins to control gene expression.
• C. Transcriptional regulators bind to DNA sequences independently, without the need for other proteins.
• D. Transcriptional regulators only function as on-off switches without interacting with other proteins.

Answer: (A)