The mechanism in a cell's connected section of the membrane that detects chemical signals is i.e. structure labelled B in the diagram. Thus, the correct option is D.
<h3>
What are receptors?</h3>
Receptors, which are large proteins that can be found within or outside of cells, are the components of a cell that are in charge of identifying chemical signals.
Whereas plasma membrane junctions interact with surface proteins found inside cells during cell to cell signaling.
Thus, it follows that the structure designated B in the diagram is the one that serves as a chemical signal receptor.
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<span>gas production also meant a doubling in the rate of photosynthesis? ... By adding a number of equal volumes of normal sodium bicarbonate
solution the concentration of carbon dioxide available to the plant is
increased and the gas production measured. Prior knowledge. Sodium hydrogencarbonate is a source of carbon dioxide.</span>