the primary high energy molecule in human metabolism is
Adenosine triphosphate (ATP)
Coenzymes
One central coenzyme is adenosine triphosphate (ATP), the universal energy currency of cells. 
NAD UNANSWERABLE They are made from four basic classes of molecule: amino acids, carbohydrates , nucleic acid and lipids.
Metabolism Metabolism
Energy from organic compounds Key biochemicals
Although some more ATP is generated in the citric acid cycle, the most important product is NADH, which is made from NAD as the acetyl-CoA is oxidize Most of the structures that make up animals, plants and microbes are made from four basic classes of molecule: amino acids, carbohydrates , nucleic acid and lipids (often called fats). 
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Metabolism [SEP] Coenzymes
One central coenzyme is adenosine triphosphate (ATP), the universal energy currency of cells. This nucleotide is used to transfer chemical energy between different chemical reactions. There is only a small amount of ATP in cells, but as it is continuously regenerated, the human body can use about its own weight in ATP per day. ATP acts as a bridge between catabolism and anabolism. Catabolism breaks down molecules, and anabolism puts them together. Catabolic reactions generate ATP, and anabolic reactions consume it. It also serves as a carrier of phosphate groups in phosphorylation reactions. A vitamin is an organic compound needed in small quantities that cannot be made in cells.