Kinases and phosphatases are essential in the cell because they directly Kinases and phosphatases are essential in the cell because they directly turn proteins "on and off" through changes in phosphorylation status. destroy IP3, turning off that signaling pathway. bind hydrophobic hormones in the cytoplasm. bind and release calcium ions. activate and repress genes.

The correct answers is "turn proteins "on and off" through changes in phosphorylation status".

Explanation:

Kinases and phosphatases are two type of enzymes that catalyze the transference of phosphate groups, where kinases add phosphate groups and phosphatases cleave them. Both are essential because turn proteins "on and off" through changes in the aforementioned phosphorylation status. Most of the phosphorylation are reversible, and they are considered as allosteric regulation

the man is bald so he has no hair to get wet

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.