Although salts of fatty acids form micelles, phospholipids and glycolipids form bimolecular sheets because of

Although salts of because of THE PRESENCE OF TWO FATTY ACYL CHAINS.
Phospholipids and glycolipid usually form bimolecular sheets because they are made up of two distinct regions, one of which is hydrophlic and the other is hydrophobic. The hydrophobic tail of each sheet interacts with one another forming a hydrophobic interior which acts as a permeability barrier.

Six amino acids have side chains that are polar but not charged. these are serine (ser), threonine (thr), cysteine (cys), asparagine (asn), glutamine (gln), and tyrosine (tyr). these amino acids are usually found at the surface of proteins, as discussed in the proteins 2 module.

The answer is constant.