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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

thing go
a separate and self-contained entity

unit, building block go
a single undivided natural thing occurring in the composition of something else

molecule go
(physics and chemistry) the simplest structural unit of an element or compound

coenzyme
a small molecule (not a protein but sometimes a vitamin) essential for the activity of some enzymes

noun.substance

6 Subcategories

cocarboxylase, thiamine pyrophosphate go
a coenzyme important in respiration in the Krebs cycle
coenzyme A go
a coenzyme present in all living cells
nicotinamide adenine dinucleotide, NAD go
a coenzyme present in most living cells and derived from the B vitamin nicotinic acid
nicotinamide adenine dinucleotide phosphate, NADP go
a coenzyme similar to NAD and present in most living cells but serves as a reductant in different metabolic processes
triphosphopyridine nucleotide go
a coenzyme of several enzymes
ubiquinone, coenzyme Q go
any of several quinones found in living cells and that function as coenzymes that transfer electrons from one molecule to another in cell respiration