Introduction -- Chemical binding -- Energies, forces and bonds -- Rates of reaction -- Transport processes -- Some techniques and methods -- Biological polymers -- Biological membranes -- Biological energy -- Movement of organisms -- Excitable membranes -- Nerve signals -- Memory -- Control of movement -- Appendix A: Elements of quantum mechanics -- Appendix B: The hydrogen atom -- Appendix C: Thermal motion -- Appendix D: Probability distributions -- Appendix E: Differential equations