Science Explorer -- Cells and Genetics

Author: Edited by Patyilla [USA], Zeng Li, Zhu Wenhua
Publisher:
Publish Date: 2002-10-01
Features: "Science Explorer" - the most authoritative research-based learning textbook in the United States. Widely used as a comprehensive science curriculum in U.S. middle schools. The best reference book for new curricula, new concepts, and new learning methods. Full set of 15 volumes: Motion, Force, and Energy; Water on Earth; Sound and Light; Electricity and Magnetism; Astronomy; Chemical Reactions; Composition of Matter; Environmental Science; From Bacteria to Plants; Cells and Genetics; Animals; Human Physiology and Hygiene; Earth's Interior; Evolution of the Earth's Surface; Weather and Climate. Explore the mysteries of science, guide research-based learning, emphasize knowledge, skills, and methods, and enjoy hands-on, brain-stimulating fun. Original version by Zengyu Education Group, used in over 20 developed countries.
Before the late 16th century, people had no way to observe cells, and no one even knew they existed. It wasn't until around 1590 that the invention of the microscope made it possible to observe very small objects. The invention of the microscope enabled the discovery and understanding of cells. When we enter a cell, a large, round object immediately catches the eye. This is the nucleus, the "brain" of the cell. You can think of the nucleus as the control center of the cell, directing all its activities.