Kinases catalyze the transfer of a phosphate group from a phosphate donor such as adenosine triphosphate (ATP) to a substrate. A well‑known kinase is hexokinase. Hexokinase catalyzes the first step of the glycolysis cycle, and converts glucose to glucose‑6‑phosphate. The reaction of glucose with ATP is shown. The enzyme‑bound base is abbreviated as :B−, and ATP is abbreviated as a diphosphate bonded to adenosine monophosphate (AMP). The first arrow of the reaction mechanism is drawn for you; draw the remaining curved arrows to show how phosphorylation occurs.

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Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.