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.

Question

Quizplus · Accepted Answer

Chemical signal pathways often involve the binding of signal molecules to a protein receptor on the surface of a target cell. This activates a downstream signaling cascade that ultimately leads to a cellular response. This mechanism is common in both animals and plants. Hormones are a type of signaling molecule, but not all chemical signal pathways involve the release of hormones into the blood. The type of molecule used in a signaling pathway can vary - some are hydrophilic, while others are hydrophobic. Bacteria also use chemical signal pathways, such as quorum sensing, to communicate with each other.

Chemical Signal Pathways