Final answer:
Gene expression in bacteria is regulated by signal transduction, where autoinducers can bind to transcription factors and affect gene expression. This is an example of a bacterial cellular function that is regulated by signal transduction.
Step-by-step explanation:
One example of a bacterial cellular function that is regulated by signal transduction is gene expression. In bacteria, signaling molecules called autoinducers bind to transcription factors and directly affect gene expression. For instance, hydrophobic autoinducers like AHL can bind to transcription factors and regulate gene expression. Peptide-based molecules can also bind kinases and initiate signaling cascades that regulate gene expression.