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:

Identify the general and special senses in humans
Describe three important steps in sensory perception
Explain the concept of just-noticeable difference in sensory perception

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

Explain in what way smell and taste stimuli differ from other sensory stimuli
Identify the five primary tastes that can be distinguished by humans
Explain in anatomical terms why a dog’s sense of smell is more acute than a human’s

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

Describe the basic structure of a typical prokaryote
Describe important differences in structure between Archaea and Bacteria

Explore the different types of bacteria reproduction.

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Bacteria, being single-celled prokaryotic organisms, do not have a male or female version. Bacteria reproduce asexually. In asexual reproduction, the "parent" produces a genetically identical copy of itself. Learn more about bacteria reproduction in this learning module produced by CK-12.

A free CK-12 account is required to view all materials.

Psychology is designed to meet scope and sequence requirements for the single-semester introduction to psychology course. The book offers a comprehensive treatment of core concepts, grounded in both classic studies and current and emerging research. The text also includes coverage of the DSM-5 in examinations of psychological disorders. Psychology incorporates discussions that reflect the diversity within the discipline, as well as the diversity of cultures and communities across the globe.Senior Contributing AuthorsRose M. Spielman, Formerly of Quinnipiac UniversityContributing AuthorsKathryn Dumper, Bainbridge State CollegeWilliam Jenkins, Mercer UniversityArlene Lacombe, Saint Joseph's UniversityMarilyn Lovett, Livingstone CollegeMarion Perlmutter, University of Michigan

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

Distinguish between sensation and perception
Describe the concepts of absolute threshold and difference threshold
Discuss the roles attention, motivation, and sensory adaptation play in perception

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.