Final answer:
Yes, zinc fingers and leucine zippers are amino acid motifs found in transcriptional activators that help bind DNA and regulate gene expression.
Step-by-step explanation:
The statement "Zinc fingers and leucine zippers are amino acid motifs found in transcriptional activators" is true. Zinc fingers and leucine zippers are indeed structural motifs that play roles in binding DNA. These motifs are part of a larger group known as DNA-binding domains, which are essential for the function of transcription factors, including activators that enhance gene expression by facilitating the binding of RNA polymerase to DNA.
Zinc fingers are typically characterized by the coordination of one or more zinc ions to help stabilize the fold, and they interact with DNA in a sequence-specific manner. Leucine zippers, on the other hand, contain leucine residues at every seventh position, facilitating dimerization, and allowing two protein subunits to join and bind to DNA.