Membranes

Question 1

Phospholipids

Answer 1

Hydrophillic head, hydrophobic tail

Question 2

Cholesterol

Answer 2

Allows for membrane fluidity/stability by stiffening the membrane

Question 3

Membrane protiens

Answer 3

Integral = embedded in lipid bilayer, receptors
Transmembrane = extend through membrane, transporters / channels
Peripheral = intracellular, receptor associated enzymes

Question 4

Membrane carbohydrates

Answer 4

Sugar coating of cells
Glycocalyx = glycoprotiens / glycolipids
Self-identity markers, role in tissue growth

Question 5

Specialised cell junctions

Answer 5

Desmosomes = adhering junctures that anchor cells together
Tight junctions = join lateral edges of epithelial cells together near their lumenal membranes
Gap junctions = communicating junctions, allow for movement of small molecules / ions

Question 6

Plasma membrane

Answer 6

Fluid lipid bilayer embedded with proteins

Trilaminar appearance