What Is the Primary Conclusion of "Domain-Swapping" Experiments with Transcriptional

Multiple Choice

What is the primary conclusion of "domain-swapping" experiments with transcriptional regulatory proteins?

A) Formation of homo- and hetero-dimers provide combinatorial control of gene expression.
B) Multiple protein:protein interactions are required to make transcription occur.
C) Enhancer elements are separate from the promoter site.
D) Zinc fingers are separate domains involved in DNA binding.
E) DNA binding elements and protein:protein interaction regions are often found in separate parts of a protein.