Explain what it means for a reaction to be endothermic and what would happen to the temperature recorded by a thermometer in an endothermic reaction.

Based on what I have read. This is what you are looking for. 
"During endothermic reactions, energy is absorbed from the surrounding environment. The energy is typically transferred in the form of heat energy, and causes the reaction mixture and its environs to cool. A thermometer can be used to detect the decrease in temperature."

Ithink a saturated phospholipid