Final answer:
In catabolite repression, transcription is influenced by the presence of glucose. Catabolite repression is a regulatory mechanism where glucose inhibits the transcription of certain genes involved in alternative sugar metabolism. When glucose levels are high, the Catabolite Activator Protein (CAP) remains inactive, leading to reduced transcription.
Step-by-step explanation:
In catabolite repression, transcription is influenced by the presence of glucose (d). Catabolite repression is a regulatory mechanism in prokaryotic cells where glucose inhibits the transcription of certain genes involved in alternative sugar metabolism. When glucose levels are high, the Catabolite Activator Protein (CAP) remains inactive, leading to reduced transcription. In the presence of low glucose levels, cAMP (cyclic AMP) accumulates, which activates CAP and increases the transcription of genes associated with alternative sugar utilization.