Cell Biology: Cell-Cell Interactions

False (B)

Cellulose and pectin

<p>secondary wall</p> Signup and view all the answers

<p>Cellulose = Provides structural integrity Pectin = Binds water and aids in cell adhesion Hemicellulose = Forms a network with cellulose Extensin = Acts as a barrier against microorganisms</p> Signup and view all the answers

<p>Cellulose (C)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Collagen</p> Signup and view all the answers

<p>Connect cells to the extracellular matrix (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>claudin and ocludin</p> Signup and view all the answers

<p>connexons</p> Signup and view all the answers

<p>Tight Junctions = Barrier for selective permeability Desmosomes = Mechanical strength Gap Junctions = Signal transmission Plasmodesmata = Connect cytoplasm of plant cells</p> Signup and view all the answers

<p>Signal relaying junctions (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Providing mechanical strength to cells</p> Signup and view all the answers

<p>Tight</p> Signup and view all the answers

<p>Plasmodesmata (D)</p> Signup and view all the answers

A specialized layer found in the kidneys, acting as a barrier between capillaries and the tubule walls, preventing the passage of proteins.

A complex network of molecules outside the cell membrane, providing structural support, regulating cell behavior, and acting as a communication hub.

A rigid, protective structure surrounding plant cells, composed of cellulose, hemicellulose, pectin, and proteins. It provides structural support, regulates cell growth, and acts as a barrier.

The main structural component of plant cell walls, a long chain of glucose molecules forming strong fibers.

Branched polysaccharides found in plant cell walls, acting as a filler and providing flexibility to the structure.

Negatively charged polysaccharides in plant cell walls, attracting water and providing gel-like properties.

Fibrous proteins in plant cell walls, providing strength and resistance against pathogens.

A type of ECM found in animals, composed of collagen, proteoglycans, and other proteins. It provides structural support and plays a role in tissue development and repair.

Cell junctions are specialized structures that connect cells and contribute to tissue organization, communication, and function. They facilitate interactions between cells and the extracellular matrix, maintaining tissue integrity and enabling coordinated responses.

Anchoring junctions, tightly connecting cells to their neighbors or the ECM, use cytoskeletal filaments for structural support. These junctions are essential for maintaining tissue integrity and resisting mechanical stress.

Adherens junctions, a type of anchoring junction, link the cytoskeleton of neighboring cells through transmembrane proteins and cadherins. They play a crucial role in maintaining cell shape and tissue integrity during development and growth.

Desmosomes, another type of anchoring junction, connect cells through intermediate filaments. They contribute to the mechanical strength and resilience of tissues, providing resistance to tearing and shearing forces.

Integrin, a transmembrane adhesion protein, mediates cell-ECM interactions. It plays a role in cell signaling, adhesion, and migration, linking the cytoskeleton to the extracellular matrix.

Tight junctions, specialized junctions that encircle cells, block diffusion of molecules between neighboring cells, forming a barrier that maintains the distinct composition of fluids within tissues. They are found in epithelial tissues.

Gap junctions, channel-forming junctions, allow direct communication between cells through the passage of ions and small molecules. They facilitate rapid and coordinated responses in tissues.

Plasmodesmata, similar to gap junctions in plants, connect the cytoplasm of neighboring cells, allowing the passage of molecules and signals. They are crucial for coordinated development and communication between cells.

The extracellular matrix (ECM) is a complex network of macromolecules secreted by cells that provides structural support, regulates cell behavior, and facilitates tissue organization. It is important for cell adhesion, migration, and differentiation.

The basal lamina is a specialized type of ECM that provides structural support for epithelial and other tissues. It acts as a barrier, regulates cell behavior, and facilitates tissue organization and function.