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WAEC Biology 2010 Papers

Question : 9

Total: 60

In cellular respiration energy is made available to organisms by

removal of a phosphate group from ADR
breaking off a phosphate group from ATP
adding a phosphate group to glucose
breaking off a hydrogen ion from NADPH

Validate

Solution:

Concept:

Energy is released when a phosphate group is removed from ATP, converting it to ADP.

Explanation:

During cellular respiration, energy is stored in the high-energy bonds of ATP molecules.

When the cell requires energy, a phosphate group is broken off from ATP.

This hydrolysis reaction releases energy and forms ADP and inorganic phosphate.

The equation is:

\text{ATP} \rightarrow \text{ADP} + \text{P}_i + \text{Energy}

Thus, the usable energy is made available by breaking the terminal phosphate bond of ATP, not by adding phosphate to glucose or removing phosphate from ADP.

Answer:

B. breaking off a phosphate group from ATP

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