Question

Which one of the following molecules does NOT contain phosphoanhydride bond(s)?

• A. Adenosine diphosphate
• B. Adenosine triphosphate
• C. Fructose-1,6-bisphosphate
• D. Pyrophosphate

Hint:

Phosphoanhydride bonds are typically found in high-energy molecules like ATP, ADP, and pyrophosphate, where they store energy. Fructose-1,6-bisphosphate, however, has ester bonds between phosphate groups.

Answer 1

The Correct Option is C

Phosphoanhydride bonds are high-energy bonds found in molecules like ATP (adenosine triphosphate) and ADP (adenosine diphosphate). These bonds link phosphate groups through oxygen atoms, and breaking these bonds releases a significant amount of energy.
- (A): Adenosine diphosphate (ADP) contains a phosphoanhydride bond between the second and third phosphate groups. Hence, statement (A) is incorrect.
- (B): Adenosine triphosphate (ATP) contains two phosphoanhydride bonds, one between the first and second phosphate groups and another between the second and third. Hence, statement (B) is incorrect.
- (C): Fructose-1,6-bisphosphate does not contain phosphoanhydride bonds. It has ester linkages between its phosphate groups, not phosphoanhydride bonds. Thus, statement (C) is correct.
- (D): Pyrophosphate consists of two linked phosphate groups by a phosphoanhydride bond. Therefore, statement (D) is incorrect.
Thus, the correct answer is (C).