Final answer:
Dissolved gases such as nitric oxide (NO) can act as signal molecules, even though they cannot directly interact with proteins. They can affect membrane lipids and indirectly influence protein function.
Step-by-step explanation:
No, the statement is false. Dissolved gases such as nitric oxide (NO) can act as signal molecules. While it is true that they cannot interact directly with proteins, they can still affect membrane lipids and indirectly influence protein function.
Nitric oxide (NO) is a gas that can diffuse across the plasma membrane and interact with receptors in smooth muscle. It induces relaxation of the tissue. Additionally, nitroglycerin, a treatment for heart disease, triggers the release of NO, causing blood vessels to dilate and restore blood flow to the heart.