Signal transduction pathways that include a phosphorylation cascade are generally initiated by a phosphorylase enzyme and limited to one step
are generally inactivated by a kinase enzyme and decrease signal transduction efficiency
are propagated by steroid hormone receptors to reach the final cellular response in one step
cause a structural change in each phosphorylated protein, with the addition of a phosphate group to activate the protein

Signal transmission paths Learn how signals are transmitted within a cell from the cell membrane receptor. The chains of molecules that pass intracellular signals are known as intracellular signal transduction pathways.

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.