Which of the following statements is LEAST accurate:

W) tetraethyl lead was once commonly added to gasoline to prevent engine knocking

X) free radicals are not known to play a role in biological processes

Y) catalase reacts with hydrogen peroxide to form water and oxygen

Z) bottled mineral water typically contains higher total dissolved solids than tap water
X) FREE RADICALS ARE NOT KNOWN TO PLAY A ROLE IN BIOLOGICAL PROCESSES