In cells, multiple biochemical pathways are interconnected and often run simultaneously. which elements act as regulatory checkpoints on these diverse pathways?

The enzymes act as the regulatory check points for the multiple biochemical pathways that are interconnected to each other. The enzymes ensure that the adequate conditions are present for the biochemical pathways. The checkpoints allow an reaction to continue only if the conditions are suitable. The different stages of the cell cycle and other pathways undergo these checkpoints.

c.more precipitation,but only when emission levels.