Scientist. Cells and Genetics

Author: Edited by [US] Padilla, Zeng Li, Zhu Wenhua
Publisher:
Publish Date: 2002-10-01
Features: "Science Explorer" - the most authoritative research-based learning textbook in the US. Widely used comprehensive science textbook in American middle schools. The best reference book for new curriculum standards, new concepts, and new learning methods. A full set of 15 volumes:
Movement, Force, and Energy; Water on Earth; Sound and Light; Electricity and Magnetism; Astronomy; Chemical Reactions; Matter Composition; Environmental Science; From Bacteria to Plants; Cells and Genetics; Animals; Human Physiology and Hygiene; Earth's Interior; Earth's Surface Evolution; Weather and Climate. Explore the mysteries of science, guide research-based learning, emphasize knowledge, skills, and methods equally, and make learning fun with hands-on activities. Original version by Zengyong Education Group, used in over 20 developed countries.
Before the late 16th century, people had no way to observe cells, and even no one knew their existence. It wasn't until around 1590 that the invention of the microscope allowed people to observe very small objects. The invention of the microscope made it possible to discover and understand 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.