Question

when atp is used for energy, what happens to the molecule?

it gains two phosphate groups

it bonds with carbon dioxide

it loses one phosphate group, forming adp and releasing energy

it breaks down into glucose and oxygen

question 23

why is atp often called the \energy currency\ of the cell?

it is unique to plant cells only

it can only be used once and cannot be recycled

it stores information like a code

it can be used, recharged, and transferred like money to fuel processes

Explanation:

For the first question: ATP (adenosine tri - phosphate) has three phosphate groups. When it is used for energy, it undergoes hydrolysis. The bond between the second and third phosphate group is broken, losing one phosphate group. This forms ADP (adenosine di - phosphate) and releases energy. Option a is incorrect as it loses, not gains phosphate groups. Option b is wrong because ATP does not bond with carbon dioxide when used for energy. Option d is incorrect as ATP breakdown does not produce glucose and oxygen.
For the second question: ATP is called the "energy currency" because it can be used (by losing a phosphate group to release energy), recharged (by adding a phosphate group back to ADP to form ATP, usually through cellular respiration or photosynthesis), and transferred. It is not unique to plant cells (so option a is wrong), it can be recycled (so option b is wrong), and it does not store information like a code (DNA stores genetic information, so option c is wrong).

Answer:

For the first question: C. It loses one phosphate group, forming ADP and releasing energy
For the second question: D. It can be used, recharged, and transferred like money to fuel processes