When is a frog not like a frog ?

Where can dna be found in a prokaryotic cell

What’s the student’s scientific question

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