Question

How many phosphoester (phosphate ester) and phosphoanhydride bonds are in adenosine monophosphate (amp) and adenosine diphosphate (adp)?

Answer 1

The bond between CH2 and P of phosphate through O is called phosphoester bond. Only one such bond is present in both AMP and ADP.Link of phosphate groups through O by elimination of water molecule is called phosphoanhydride bond.In AMP, only single phosphate group present so no phosphoanhydride bond is present. But inADP, two phosphate groups are linked by one phospoanhydride bond.AMP  1  0ADP   1  1

Answer 2

Answer: The correct answer is -

The number of phosphoester bond in-

AMP (adenosine monophosphate) = 1

ADP ( adenosine diphosphate) = 1

The number of phosphoanhydride  bonds in -

AMP = 0

ADP = 1

Phosphoester bond is formed when the alpha phosphate (that is the first phosphate) present in ADP and AMP links to the 5' carbon of ribose sugar through oxygen.

On the other hand, Phosphoanhydride bond is formed between two phosphate. As ADP has two phosphate, thus it contains one phosphoanhydride bond and the first phosphate is linked to ribose via one phosphoester bond.

AMP has single phosphate, so no phosphoanhydride bond is there, only one phosphoester bond is present in it.