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When a receptor protein acts as an enzyme, the receptor protein activates a second messenger that acts as a signal molecule within the cell. Resources: HOLT Biology Textbook - 9th grade edition Chapter 4, Cells and Their Environment.
A person that acts as a messenger between two people is not helping anyone. This type of situation can cause problems and should be dealt with without a messenger.
steroids
Ribosomes
One example of a cation that acts as a cofactor for enzymes involved in normal membrane function is calcium (Ca2+). Calcium ions play a crucial role in maintaining membrane integrity and stability. They are involved in processes such as cell adhesion, signal transduction, and regulation of ion channels that are essential for cell membrane function.
Peace
Intracellular receptor
Arguably the whole of the Acts of the Apostles is about the apostle Paul, but the second part is certainly about Paul.
G-protein-linked receptor
yes its super effective and acts like an antenna
Before we attempt an Answer we need to know how many dozens of types of signal molecules exist in a Cell's cytoplasm.
ISI accurs when the LOS of a signal is received simultaneously with copy(s) of another signal . the copy(s) acts as a noise to the LOS signal if its level is high ,recovery of the LOS signal is difficult.