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The article presents information related to the science education. The basic unit of all living organisms is the cell. A cell is composed of two parts, that is, central nucleus and a surrounding cytoplasm. The nucleus and the cytoplasm are separated from each other and from their environment by exceedingly delicate lipoid films. Both nucleus and the cytoplasm show opposite qualities. The nucleus is relatively acid, and the cytoplasm is relatively alkaline. Between the nucleus and the cytoplasm there is an electric strain, or potential difference, which makes it possible for an electric current to flow between them. This electric strain is the result of an oxidation in the nucleus, which takes place on a higher scale than oxidation in the cytoplasm. The oxidation produces a surplus of positively charged hydrogen ions in the nucleus.