The motherboard mounts to the case via small connectors called fire wires leds nylon bolts standouts

I believe the small connectors are called standouts that slide into keyed slots of screw into the bottom of the case. Standouts are sometimes referred to as a stand off or spacer. They are small metal or plastic screws that attaches the mother board to a computer case and holds the mother board to the case.

Biochemistry, it deals with the chemical constitution, the breakdown and the synthesis of plant and animal products.