Arrange the following sequence of extracellular signaling in the correct order? 1) Transport of signal to a target 2) Start of signal transduction pathways 3) Signaling cell synthesize and release signaling molecules 4) Binding of the signal to the specific receptor

Arrange the following sequence of extracellular signaling in the correct order? 1) Transport of signal to a target 2) Start of signal transduction pathways 3) Signaling cell synthesize and release signaling molecules 4) Binding of the signal to the specific receptor Correct Answer 3, 1, 4, 2

Specific extracellular signaling molecules are defined for each cell. Extracellular signaling involves the synthesis and release of signal molecules, which bind to the specific receptor and initiate signal transduction pathway.

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The figure shows two signaling molecules binding to a transmembrane receptor protein (shown at I). What do these signaling molecules do?