Alcohol is a poison (for yeast as well as for people) and so the yeast is not able to grow when the alcohol content gets too high. This is why wine is never more than about 12% alcohol.
Ideally the strong nuclear force would say how the protons and neutrons are bonded together, but there is a conceptual chasm in this area. It is unclear how the residual nuclear force (at nucleus level) emerges from the strong force (at quark level), except as a general concept that the gluons leak out.
This organelle is surrounded by nuclear membranes, to protect it. The nucleus holds the DNA of the cell. Inside of the nucleus may be an organelle called the nucleolus. This organelle holds the RNA of the cell: it is composed of proteins and nucleic acids.