Cell adhesion molecules are membrane or extracellular glycoproteins that attach cells to neighbours or extracellular matrix; These attachments help maintain tissue structure and communication between neighbouring cells.
Cell-adhesion molecules (CAMs) are membrane proteins that bind other cells or extracellular matrix, enabling individual animal cells to assemble into organized tissues.
Specific extracellular domains bind partners while intracellular regions connect to cytoskeleton or signalling systems. Different CAM forms are used in different cell-cell junctions, giving tissues distinct strengths, barriers and communication properties.
For a CAM explanation identify: the membrane protein, its extracellular binding partner, the junction or contact formed, and the resulting mechanical or signalling effect on tissue organization.
CAM binding between neighbouring epithelial cells can connect their cytoskeletons and help the sheet resist separation while maintaining an organized boundary.
Adhesion is regulated molecular binding, not permanent glue. Detailed names of individual CAMs and junction classes are not required for this Objective.
This objective is assessed through multiple choice, commonly using Identify.
Identify
Build the answer around this relationship: Cell adhesion molecules help cells attach to other cells or extracellular matrix.
Representative question
Animal cells often secrete glycoproteins as extracellular components. What is a role of these glycoproteins?
Adhesion
Additional energy reserve
Membrane fluidity
Water uptake
A
The HL extension asks how membrane structure becomes dynamic cell behaviour. Fatty acid saturation and cholesterol tune fluidity. Fluid membranes form and fuse vesicles. Gated ion channels and sodium-potassium pumps create nerve-cell gradients and electrical responses. Sodium-dependent glucose cotransport uses a sodium gradient to move glucose indirectly against its gradient. Adhesion molecules organize tissues.