Three presentations (with images and comments): interphase, mitosis, meiosis. Four articles: cell cycle, mitosis, meiosis, comparison of mitosis and meiosis. The structure and function of cell organelles: nucleus, ribosomes, membrane, mitochondria, chloroplasts, endoplasmic reticulum, Golgi apparatus, centriole. The application is intended for high school students, teachers and students of initial courses.