Which statement about animal cell junctions is not true? a....

Which statement about animal cell junctions is not true? $a$. Tight junctions are barriers to the passage of molecules between cells. b. Desmosomes allow cells to adhere strongly to one another. c. Gap junctions block communication between adjacent cells. d. Connexons are made of protein. e. The fibers associated with desmosomes are made of protein.

Which statement about animal cell junctions is not true?
$a$. Tight junctions are barriers to the passage of molecules between cells.
b. Desmosomes allow cells to adhere strongly to one another.
c. Gap junctions block communication between adjacent cells.
d. Connexons are made of protein.
e. The fibers associated with desmosomes are made of protein.

Key Concepts

Connexons

Connexons are the protein complexes that form the backbone of gap junction channels. Composed of connexin proteins, connexons pair with those on adjacent cells to create a continuous aqueous pathway that enables the intercellular transfer of signals and small molecules.

Gap Junctions

Gap junctions are specialized channels that allow direct communication between the cytoplasm of adjacent cells. They facilitate the passage of ions, metabolites, and small signaling molecules, enabling coordinated cellular responses and maintaining tissue homeostasis.

Tight Junctions

Tight junctions are intercellular connections that form a seal between cells, preventing the free passage of substances through the space between them. They help maintain cell polarity by restricting the movement of membrane proteins and lipids between the apical and basolateral surfaces of cells.

Animal Cell Junctions

Animal cell junctions are specialized structures that connect adjacent cells, providing structural support, facilitating communication, and regulating the passage of molecules between cells. They include various types of junctions, each with a unique role in maintaining tissue integrity and function.

Desmosomes

Desmosomes are adhesive junctions that mechanically link adjacent cells together, providing strength and resistance to mechanical stress. They are characterized by dense protein plaques and intermediate filament attachment, which collectively help distribute tension across tissues.

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