What is ATP and why is it considered the energy currency of the cell?

• A. ATP stores energy in phosphate bonds; hydrolysis releases energy used for cellular work; regenerated from ADP.
• B. ATP stores energy in carbon-carbon bonds; hydrolysis releases energy used for cellular work; regenerated from ADP.
• C. ATP stores energy in peptide bonds; hydrolysis releases energy used for cellular work; regenerated from ADP.
• D. ATP stores energy in phosphate bonds; hydrolysis releases energy used for cellular work; regenerated from NADH.

Answer: (D)