Answer:
Sigma factors bind to the promoter region of a particular gene and facilitating the binding of RNA Polymerase to the promoter region (formation of the RNA polymerase holoenzyme complex) in order initiate transcription of the gene.
Put simply - Helps RNA Polymerase do it's job.
ATP
Explanation:
ATP is produced in the cells and its conversion to energy is a single-step process.
Answer: passive transport requires chemical energy to move nutrients from areas of low concentration to areas of high concentration
extrinsic
