5. The original three tenets of the cell theory are__?
(A) all organisms have DNA, all organisms
are made of cells, and all cells produce proteins；
(B) all organisms are made of one or more
cells, the cell is the fundamental unit of life, and all cells come from preexisting cells；
(C) all
organisms are made of one or more cells, all cells contain DNA, and all cells come from
preexisting cells；
(D) all organisms have DNA, DNA is the fundamental unit of life, and all
cells come from preexisting cells.