Starting from glucose and UTP and ATP, how many high-energy bonds are broken\consumed to add that glucose to a glycogen molecule?
A) 1
B) 2
C) 3
D) 4
E) The answer cannot be determined form the information given.

Question

Quizplus · Accepted Answer

Two high-energy bonds are consumed in the process of adding a glucose molecule to a glycogen chain. The first is the conversion of glucose to glucose-1-phosphate, which consumes one ATP (breaking two high-energy bonds). The second is the conversion of glucose-1-phosphate to UDP-glucose, which does not consume an ATP but involves the hydrolysis of UTP to UDP and inorganic phosphate, breaking another two high-energy bonds. However, since the question asks for the number of high-energy bonds broken/consumed, not the number of ATP molecules used, the correct answer is 2, considering the process as a whole.

Starting from Glucose and UTP and ATP, How Many High-Energy