The 180 exchange experiment ATP+HoO The AGo for AtP Readily rever sibl reactions lr I I synthesis on purified ADP Fi is close to zero 18 O (Paul Boyer) 18O-P=180 O Enzyme (F1)The 18O exchange experiment : The G` 0 for ATP synthesis on purified F1 is close to zero! (Paul Boyer) Readily reversible reactions Keq = 2.4 G`0 = 0