Multiple Choice
Two phosphoric acid molecules can combine to make pyrophosphoric acid and another molecule as shown here. The pyrophosphoric acid molecule is a phosphoester and is a structural element in the ADP/ATP metabolic energy system. What molecule is represented by the question mark in the structural reaction equation below?
A) O2
B) OH-
C) H2O
D) PO
E) H2
Correct Answer:

Verified
Correct Answer:
Verified
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