Question

the junction type that lets neighboring cells exchange small molecules is the
○ desmosome.
○ gap junction.
○ hemidesmosome.
○ tight junction.
○ zonula adherens.

Explanation:

To solve this, we analyze each option:

• Desmosome: Mainly for cell - cell adhesion, not for small molecule exchange.
• Gap junction: It has channels that allow neighboring cells to exchange small molecules like ions, metabolites, etc.
• Hemidesmosome: Attaches cells to the extracellular matrix, not for inter - cell small molecule exchange.
• Tight junction: Forms a barrier to prevent the passage of molecules between cells, not for exchange.
• Zonula adherens: Involved in cell - cell adhesion, not in small molecule exchange.

Answer:

B. gap junction.