Question

what is the main responsibility of carbohydrates attached to the cell membrane? extra support identification marker semi - permeability

Explanation:

Carbohydrates attached to the cell membrane, often in the form of glycoproteins or glycolipids, act as identification markers. They help cells recognize each other, which is crucial for processes like the immune response (where immune cells need to distinguish self - cells from foreign cells) and cell - to - cell communication. Extra support is more of a function associated with structures like the cell wall (in plant cells) or the cytoskeleton. Semi - permeability is a property mainly related to the lipid bilayer and membrane proteins of the cell membrane, not the carbohydrates.

Answer:

identification marker