Final answer:
Combinatorial control of gene expression is true, involving various transcriptional regulators. Gene expression is intricately regulated at multiple stages, including epigenetic, transcriptional, and post-transcriptional levels. Transcription factors play a vital role in influencing RNA polymerase binding and thus gene transcription.
Step-by-step explanation:
Combinatorial control of gene expression involves groups of transcriptional regulators working together to determine the expression of a gene. This statement is true.
Gene expression is regulated at various levels including epigenetic, transcriptional, post-transcriptional, translational, and post-translational stages. Transcription factors, which are proteins that bind to DNA, can function as either activators or repressors and are crucial in the regulation of transcription. They control gene expression by influencing the binding of RNA polymerase to specific genes, which in turn determines whether a gene is transcribed into mRNA.
Regulation may occur at any stage of protein synthesis or processing, ensuring that proteins are produced at the right time and place. This is particularly important during organism development and cell division control, and mutations in these regulatory genes can lead to cancer.