How does a protein kinase cascade work? what does it do to the original signal?

A protein kinase is an enzyme which catalysis the phosphorylation reaction.

The phosphorylation can either activate or deactivate other proteins or receptors.

A protein kinase cascade refers to the series of events in which a chain reaction of phosphorylation takes place by which thousands of proteins are phosphorylated.

It helps in signal transduction through which signals (usually hormone) from outside the cell are amplified and transferred to the target molecule present inside the cell.

For example, tyrosine kinase cascade.

the oceanic zone is typically defined as the area of the ocean lying beyond the continental shelf, but operationally is often referred to as beginning where the water depths drop to below 100 meters (328 feet), seaward from the coast to the open ocean.

explanation:

✿   this landform has a high elevation and a high relief

✿   this landform is a mountain