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A signalling molecule, epinephrine (adrenaline), is released from the adrenal gland when a human feels threatened - VCE - SSCE Biology - Question 3 - 2013 - Paper 1
Question 3
A signalling molecule, epinephrine (adrenaline), is released from the adrenal gland when a human feels threatened. The molecule is transported in the bloodstream and... show full transcript
Worked Solution & Example Answer:A signalling molecule, epinephrine (adrenaline), is released from the adrenal gland when a human feels threatened - VCE - SSCE Biology - Question 3 - 2013 - Paper 1
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b. Receptors for epinephrine are found on the exterior surface of the plasma membrane of cells. What does this suggest about the nature of the epinephrine molecule?
Answer
The presence of receptors for epinephrine on the exterior surface of the plasma membrane suggests that epinephrine is a hydrophilic (water-soluble) molecule. This property allows it to interact with receptor proteins on the cell surface, enabling it to trigger specific cellular responses without needing to enter the cell.