Question

Which of the following releases energy?

Nutrients entering a cell through the cell membrane
Removing a phosphate group from an ATP molecule

Building sugar or starch molecules for long-term energy storage
Adding an additional phosphate group to an ADP molecule

Answer 1

Cellular resperation releases ATP energy by breaking down the bonds in glucose in the oxygen, energy is produced in order to add a phosphate group to ADP to form ATP.

Answer 2

Removing a phosphate group from an ATP molecule

Step-by-step explanation:

ATP or Adenosine Triphosphate molecule is called energy currency of the cell because organisms store energy in them. It is used for energy storage for reactions inside body and used whenever energy is required. It is made of adenine base which is attached to a ribose sugar. The sugar moiety is further attached to three phosphate groups.

The three phosphate groups are bonded to each other by two phosphoanhydride bonds which are high energy bonds. When the first phosphoanhydride bond is broken by hydrolysis, a phosphate group is removed from ATP and it is converted into ADP releasing a lot of energy. Second phosphoanhydride bond can also be broken to convert ADP to AMP again releasing energy.