What role do atp and nadh play in living cells?
a they provide structural support to cell membranes.
b they store and transfer energy.
c they are involved in cell-to-cell signaling.
d they also store and transfer information.

The answer to this question would be: B They store and transfer energy. 

Adenosine triphosphate or ATP and NADH is used by the organism to provide energy. But ATP is more frequently used and making ATP is easier than making NADH. Digested food will be used to form ATP, which can be used to contract the muscle cells or to make the pump in cell membrane works.

The infrared (ir) and the ultraviolet(uv) represent the two extremities of the visible spectrum (400-700nm). while ir represents electromagnetic radiation with wavelengths longer than those of visible light, uv represents wavelengths shorter than visible light