SciHawks

AP Chem - we learned the procedure for drawing the Lewis structure of an odd-electron (valence) molecule i.e. a "free-radical" and we saw that these molecules are relatively highly reactive due to the attraction of the lone/unpaired electron to the nuclei of other free radical molecules without the impossibility of having three or more electrons in a single orbital overlap / bonding region.
Free radicals are very reactive; thus, they can react with and mutate DNA leading to non-functional-protein synthesis and cell death.

Bio - took our unit exam on photosynthesis and cellular respiration.