Biology 2e is designed to cover the scope and sequence requirements of a typical two-semester biology course for science majors. The text provides comprehensive coverage of foundational research and core biology concepts through an evolutionary lens. Biology includes rich features that engage students in scientific inquiry, highlight careers in the biological sciences, and offer everyday applications. The book also includes various types of practice and homework questions that help students understand—and apply—key concepts. The 2nd edition has been revised to incorporate clearer, more current, and more dynamic explanations, while maintaining the same organization as the first edition. Art and illustrations have been substantially improved, and the textbook features additional assessments and related resources.

By the end of this section, you will be able to do the following:

Describe how viruses were first discovered and how they are detected
Discuss three hypotheses about how viruses evolved
Describe the general structure of a virus
Recognize the basic shapes of viruses
Understand past and emerging classification systems for viruses
Describe the basis for the Baltimore classification system

This resource provides a detailed diagram of animal, bacterial and plant cells and viral structure. Also included are detailed drawings, with definitions, of each of the cellular organelles.

A brief overview of viruses from the University of California. Discusses the difference between the lysogenic phase and the lytic phase, gives examples of viral diseases, and provides information on the relationship between viruses and mass extinction. Diagrams are also provided.