Question

The primary function of polysaccharides attached to the glycoproteins and glycolipids of animal cell membranes is

A) to facilitate diffusion of molecules down their concentration gradients.
B) to actively transport molecules against their concentration gradients.
C) to maintain the integrity of a fluid mosaic membrane.
D) to maintain membrane fluidity at low temperatures.
E) to mediate cell-to-cell recognition.

Answer 1

Glycoproteins and glycolipids attached to the outer lipid layer of animal cell membranes play a crucial role in cell-to-cell recognition and interactions with the external environment.

Step-by-step explanation:

Glycoproteins and glycolipids are carbohydrate complexes attached to the outer lipid layer of animal cell membranes. These carbohydrates play a primary role in cell-to-cell recognition. They form specialized sites on the cell surface that allow cells to recognize each other and enable interactions with the external environment. This recognition function is crucial as it allows the immune system to differentiate between self and non-self cells or tissues.