complex organic substances secreted by certain cells of plants and animals which
cause a chemical
change in the substance upon which they
act.
complex organic substances secreted by certain cells of plants and animals which
cause a chemical
change in the substance upon which they
act. In the lecture, this
word is used humorously with no
particular meaning.
substances produced in
plant and
animal cells that
cause a chemical
change in other substances but are not changed themselves.