A cell's daily operations are accomplished through the biochemical reactions that take place within the cell. Reactions are turned on and off or sped up and slowed down according to the cell's ...
The cell can control a metabolic pathway by the presence or absence of a particular enzyme. The cell can also regulate the rate of reaction of key enzymes. The binding of the enzyme to its ...
In other cases, secondary reactions are physiologically irrelevant ... Promiscuous activities are important because they provide opportunities for evolution of new enzymes and new metabolic pathways, ...