CELL MEMBRANE STRUCTURE

Question 1

Fluid mosaic model

Answer 1

the fluid mosaic model describes the arrangement of molecules in the membrane.
- in this model, phospholipids forms a double continuous layer called the bilayer which is fluid since its constantly moving.

Question 2

proteins in fluid mosaic model

Answer 2

protein is scattered in the fluid mosaic model like the tiles, which contains channel proteins and carrier proteins that allows the movement of ions and large molecules through the membrane.
- also the cell surface membrane consists of the receptor proteins that allows the cell to detect chemicals released from other cells.

Question 3

glycoproteins and glycolipids

Answer 3

protein with a polysaccharide chain attatched
- lipoid with a polysaccharide chain attatched.

Question 4

phospholipids

Answer 4

phospholipids have a hydrophilic head and a hydrophobic tail so the center of the phospholipid bilayer is hydrophobic, so it doesnt allow water soluble substances to pass through it.

Question 5

cholestrol - gives membrane stability

Answer 5

• cholesterol is a type of lipid present in almost all cell except bacterial cell.
• cholesterol molecules binds to the hydrophobic tail causing them to pack more closely together which makes the membrane more rigid .
• cholestrol helps to maintain shape of animal cells