Multiple choice

Which statement is not true for gap junctions?

  1. They allow the passage of proteins between cells.

  2. They are essential for metabolic cooperation between cells.

  3. They occur in the developing embryo.

  4. They synchronise the beating rate of heart muscle cells.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gap junctions are intercellular channels that allow the passage of small molecules and ions between adjacent cells, but NOT proteins or larger macromolecules. They are crucial for metabolic cooperation, electrical coupling in heart muscle, and embryonic development. Option A incorrectly claims they allow protein passage.

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