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:

List the components of the endomembrane system
Recognize the relationship between the endomembrane system and its functions

This pathway explores the different types of cells, including eukaryotic, prokaryotic and plant cells, and their structures.

This pathway provides an introduction to cells as the basic unit of life and their structure and function. Prokaryotic, eukaryotic and plant cells are compared and the structure and function of different organelles is discussed. For a deeper look at this topic, we recommend the pathway Cell Structure from the OpenStax textbook Biology for AP® Courses.

Webelements offers a nice presentation on erbium, its properties, uses and history, along with basic data. Clearly presented.

The third in a series of three lessons,that focus on regular verbs in the present tense. Fantastic summary of regular present tense conjugations and the use of subject pronouns. The explanation is thorough and easy to understand. The lesson also lists common -ar, -er, and -ir verbs that are regular in the present tense.A short test at the end of the lesson tests the student's mastery of this grammar principle.