EVERYDAY SCIENCE

Detailed explanation-1: -Integral proteins may serve as channels or pumps to move materials into or out of the cell. Peripheral proteins are found on the exterior or interior surfaces of membranes, attached either to integral proteins or to phospholipid molecules.

Detailed explanation-2: -Answer and Explanation: The macromolecules that make up the plasma membrane are lipids, proteins and carbohydrates. Phospholipids are the main lipid in the plasma membrane. Each phospholipid has a hydrophobic head and a hydrophilic tail.

Detailed explanation-3: -The channels and pumps that traverse the cell membrane are made out of proteins. Proteins can fold into a structure that allows specific materials to pass through them. They act as a tunnel, connecting the inside and outside of the cell.

Detailed explanation-4: -Channel proteins are proteins and thus made of amino acids. The amino acid sequence determines the structure of the channel.

Detailed explanation-5: -A channel protein, a type of transport protein, acts like a pore in the membrane that lets water molecules or small ions through quickly. Water channel proteins (aquaporins) allow wate r to diffuse across the membrane at a very fast rate. Ion channel proteins allow ions to diffuse across the membrane.