Ralph researcher studies transcription of his favorite gene, fave1, in bacteria. he notes that the wildtype strain of bacteria constantly expresses favorite-1 protein unless he the protein squash-1 is also expressed. when squash-1 is expressed, the level of favorite-1 protein decreases. one of his mutant strains continues to express favorite-1 protein regardless of whether squash-1 is present or not. what might be the regulatory mechanism of the gene coding for favorite-1 and what is the role of squash-1?

The Squash-1 protein functions as a repressor, therefore, the expression of Favorite-1 protein is mediated by negative regulation. In the transcription of FAVE-1 or the favorite gene, the Squash-1 functions as a repressor. Thus, the production of Favorite-1 protein diminishes because of the negative regulation as the binding of repressor protein with the operator gene takes place.

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.