4.1: Structure of the cell membrane Flashcards
All cells are surrounded by a
membrane
In eukaryotic cells, many of the organelles are surrounded by a
membrane
Partially permeable
Allow some molecules through but not others
Membranes around organelle act as a …
dividing the cell into different …
barrier between organelles and the cytoplasm
compartments
Cell membranes structure
fluid mosaic structure
Cell membranes mainly composed of
lipids, proteins and carbohydrates
Fluid mosaic model
describes
arrangement of molecules in the membrane
Fluid mosaic model
in the model
Phospholipid molecules form a continuous double layer (bilayer) which is fluid
Proteins on/in the bilayer
receptor proteins, channel proteins and carrier proteins
Glycoproteins
proteins have a polysaccharide chain attached to them
Glycolipids
lipids have a polysaccharide chain attached to them
Centre of the phospholipid bilayer is
hydrophobic
Cholesterol is a type of
lipid
Where is cholesterol present in cells
all cell membrane except bacteria cell membranes
Where is cholesterol present in cell membranes
between phospholipids