a cholesterol molecule

a transmembrane protein

a glycoprotein

a phospholipid

a glycolipid

cholesterol

carbohydrate

protein

phospholipid

Non-polar molecules

Hydrolytic

Ionised 

Amphipathic 

Polar molecules

Unsaturated fatty acids are more polar than saturated fatty acids

The double bonds form kinks in the fatty acid tails, preventing adjacent lipids from packing tightly

Unsaturated fatty acids have a higher cholesterol content and therefore more cholesterol in membranes

The double bonds block interaction among the hydrophilic head groups of the lipids.

enables the membrane to stay fluid more easily when cell temperature drops

enables the animal to remove hydrogen atoms from saturated phospholipids

enables the animal to add hydrogen atoms to unsaturated phospholipids

makes the membrane less flexible, allowing it to sustain greater pressure from within the cell

glycoprotein

cholesterol

triacylglyceride

glycolipid

Parallel beta pleated sheet

Antiparallel beta pleated sheet

Parallel alpha helix

Antiparallel alpha helix

11, 12 and 13

2, 7 and 8

7, 8 and 13

1, 4 and 6

12

1

6

5

Nucleolus

Nucleoid region

Plasmid

Plastid

Nucleus