ATP, easy as 123.
ATP is the renewable energy source for our cells. It consists of 3 phosphates, a sugar and an adenine ring. The bond between the last 2 phosphate groups is a weak unstable bond. When broken, ATP is changed to ADP and a phosphate, releasing energy to be used in cellular reactions. ATP stores regenerate when energy from respiration reactions is used to reattach the phosphate a an ADP. ATP is soluble and hence easily transported. Every chemical reaction in every cell requires or produces ATP molecules. Most ATP is made in the mitochondria and diffuses into the cytoplasm and to membranes. ATP is used in movement, locomotion, structure, metabolism, synthesis, active transport, cellular signalling, DNA and RNA synthesis.