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State whether the following is true or false.
Nitric oxide can act as a signalling molecule despite being a gas.

  • A.False
  • B.True only at large scales
  • C.False only at small scales
  • D.True

Answer: D

It diffuses through membranes directly and acts on an enzyme inside the target cell, relaxing smooth muscle in blood vessels. Its very short life limits its action to the immediate neighbourhood. Nitroglycerin relieves angina by releasing it in the vessel wall.

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