Which of the following is NOT part of the cell theory? a. All living things are made up of cells
b. All cells must have a cell membrane, cytoplasm, DNA, and ribosomes
c. The cell is the basic unit of Structure and Function in living things
d. All new cell must come from preexisting cells

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons