Chemical Signal Pathways

question 16

Multiple Choice

Chemical signal pathways

• A)operate in animals, but not in plants.
• B)are absent in bacteria, but are plentiful in yeast.
• C)involve the release of hormones into the blood.
• D)often involve the binding of signal molecules to a protein on the surface of a target cell.
• E)use hydrophilic molecules to activate enzymes.

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