Discussion
State whether the following is true or false.
All cell signalling requires a molecule to be released into the surroundings.
Answer: C
Correct answer: False
Two important modes involve no release at all. Contact-dependent signalling works through membrane-bound molecules on cells that touch, and gap junction signalling passes small molecules directly between joined cytoplasms without either ever entering the extracellular space. Both are used precisely because they are addressed to particular neighbours rather than broadcast.
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