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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

matter go
that which has mass and occupies space

substance go
the real physical matter of which a person or thing consists

activator go
(biology) any agency bringing about activation

accelerator, catalyst go
(chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected

enzyme go
any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions

nuclease go
general term for enzymes that catalyze the hydrolysis of nucleic acid by cleaving chains of nucleotides into smaller units

endonuclease go
a nuclease that cleaves nucleic acids at interior bonds and so produces fragments of various sizes

restriction endonuclease, restriction nuclease, restriction enzyme
any of the enzymes that cut nucleic acid at specific restriction sites and produce restriction fragments

noun.substance

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