The prokaryotic cell lacks a nucleus and membrane bound organelles.
There are 56 neutrons. To find them, you just have to subtract the atomic number with the atomic mass. If you dont know, the atomic number is the number of protons (and electrons) in an atom. The atomic mass is the number of both the protons and neutrons. Of you subtract the atomic number, you get protons.
I think that u need to use the book because it said which part from number 3? not sure tho<span />
