Glucose is a monosaccharide. it may combine with another monosaccharides by a process called and form a disaccharide

Condensation is the process of merging the monomers into polymers that lead to the removal of water.

1. The repeating units in a fatty acid are just carbon atoms. They usually have two hydrogens attached, but can have one (in unsaturated fats) or three (at the end of the chain). This is simpler than nucleic acids and proteins. 

2. Fatty acids are used to make phospholipids, which make up most of the mass of a cell membrane. The fatty acid portion of a phospholipid is very hydrophobic (does not mix with water).