Calculate the number of repetitions of the β-oxidation pathway required to fully convert a 18-carbon activated fatty acid to acetyl-scoa molecules.

The answer is 5. An acetyl group (comprising two C atoms) is divided off the original fatty acyl-SCoA with each recurrence of the beta-oxidation spiral. So, the first repetition of the beta-oxidation produces one acetyl-SCoA molecule and a fatty acyl-SCoA molecule that is two carbon atoms smaller than the initial fatty acyl-SCoA. There will be five acetyl-SCoA molecules made by the fifth repetition. 

particle   p is an electron and particle q is a neutron

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer