Question

The number of substrate level phosphorylations in one turn of citric acid cycle is :

a) Two

b) Three

c) Zero

d) One

Answer 1

d) One

Explaination:

During Krebs' or citric acid cycle, succinyl-CoA is acted upon by enzyme succinyl-CoA synthetase to form succinate (a 4C compound). The reaction releases sufficient energy to form ATP (in plants) or GTP (in animals) by substrate-level phosphorylation. GTP can then be used to form ATP.