Which of the following is true about GAL4?

GAL4 is a well-studied transcription factor found in yeast, particularly known for its role in the regulation of genes involved in the utilization of galactose. This protein binds to specific DNA sequences called UAS (Upstream Activation Sequences) located upstream of the target genes. When GAL4 binds to these sites, it activates transcription of the genes necessary for galactose metabolism, thereby playing a crucial role in the switch between different carbon sources.

The ability of GAL4 to regulate specific genes in response to the presence of galactose makes it an important component of the metabolic pathways that allow yeast to adapt to different environmental conditions. Its function as a transcription factor highlights the significance of protein-DNA interactions in gene regulation, which is fundamental to understanding genetic expression and the responses of organisms to different nutrients.

In summary, the assertion that GAL4 is a transcription factor that regulates specific genes is accurate, reflecting its crucial role in controlling gene expression related to galactose metabolism.