In generalization, native speakers choose the plural. Such compositions as— An enzyme is produced by a living organism. A cow is a quadruped.
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SupercatMy book saysThe electroencephalograph is a machine for measuring brain waves.An electroencephalograph is a machine for measuring brain waves.Electroencephalographs are machines for measuring brain waves.are all okay.Of course they are grammatically OK, but they are in a grammar book.
Supercat So they are different to generaliza