This type of molecule is the most common energy source for all cells and enters the cell by facilitated diffusion. the molecule is

The answer is glucose. Ready energy for any type of cell is glucose. Other molecules may be used for energy, but they are broken down before being used as an energy source. DNA is not used for energy; proteins are used only when an organism is in starvation mode.

this protocol provides a detailed procedure for co-immunoprecipitation (co-ip) to identify protein–protein interactions.

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.