nitrogen can form an ionic bond
One reason people are fat is because they eat and eat and eat and don't exercise. Another reason is because some people have fast working calorie burning systems and some people have slow ones causing them to be fat.
It might be that those people that are not fat have high metabolism you eat as much as you want and not get fat.
Polysaccharides have more chemical bonds.
Typically glycolysis. Glycolysis is a process by which sugars (specifically glucose) is broken down into ATP (energy). There are, however, many pathways to derive energy from differently moleculs (including lipids and carbohydrates).
Turgor pressure is what allows a blade of grass to stand up straight. This is a type of a molecule.