Question

Which part of a phospholipid is charged, or polar?

Answer 1

The phosphate heads

Explanation:

The phosphate heads are polar, which allows them to mix with water. This is why they are on the external and internal part of the cell membrane (because there's a lot of water that cells come into contact with externally, and there's a lot of water internally too). The lipid tails are the non-polar section of the phospholipid bilayer, which is why they're on the inside (so they'll be less exposed to water).