Animation Assignment, The Energy Currency: ATP
The phosphate from the compound phosphocreatine can be used to synthesize more ATP from ADP. a. True b. False
a. True Explained: Cells are able to store only small amounts of ATP. Our bodies use other energy-storing compounds, such as phosphocreatine, to quickly re-form ATP from ADP. A quick source of ATP is needed during intense exercise, such as weight lifting. Once the source of phosphate from phosphocreatine is depleted, the resynthesis of ATP is reduced, and the intense exercise will be unable to continue.
Energy used by the body to perform muscular contractions is called adenosine diphosphate, or ADP. a. True b. False
b. False Explained: The energy for contracting skeletal muscle is derived from the cell's energy currency, known as adenosine triphosphate, or ATP.
Which of the following activities requires ATP to function? a. secretions of the endocrine system b. muscular work c. nerve conduction d. All of the listed responses are correct.
d. All of the listed responses are correct. Explained: In addition to muscular work, ATP fuels all of our body's complex functions, including digestion, nerve conduction, circulation, protein synthesis, and secretions of the endocrine system.
Which of the following statements regarding ATP is incorrect? a. ATP is hydrolyzed and converted from ATP to ADP anaerobically. b. Only small amounts of ATP are stored in the body's cells. c. About seven kilocalories are released every time a phosphate bond is broken. d. The enzyme ATPase hydrolyzes the first phosphate group from the ATP molecule when energy is needed.
d. The enzyme ATPase hydrolyzes the first phosphate group from the ATP molecule when energy is needed. Explained: When energy is needed for biological work, an enzyme called adenosine triphosphatase, or ATPase, catalyzes the reaction in which the third, not the first, phosphate group is hydrolyzed from the ATP molecule. The splitting of the ATP molecule occurs anaerobically, without oxygen, and provides approximately seven kilocalories for every phosphate bond that is split.
