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:

Define osmosis and explain its role within molecules
Explain why osmoregulation and osmotic balance are important body functions
Describe active transport mechanisms
Explain osmolarity and the way in which it is measured
Describe osmoregulators or osmoconformers and how these tools allow animals to adapt to different environments

In this activity, students use the virtual lab to create stock solutions starting from solid salts. Students must first calculate the correct amount of solid to make the solution. Next, they prepare the solution using the appropriate glassware. Students can check to see if their procedure was correct using the concentration viewer in the solution info panel.

Chemical reactions are the foundation of chemistry, and understanding how elements combine and in what ratios helps us to understand the world around us. This pathway provides resources about how different chemicals react, and the ratios in which they react, a field of study known as Stoichiometry (literally: element measuring).

This digital textbook covers core chemistry concepts and includes interactive features, real-world examples, and videos.

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

A complete, web-based, multi-media textbook covering a wide variety of Chemistry concepts.

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

The goal of this lesson is for students to understand just how many particles Avogadro's Number truly represents, or, how big a mole really is. [19:02]

This narrated screencast illustrates the relationships shown by the ideal gas law. [4:00]

Provides a definition for both mole and molar mass and gives a step-by-step example problem to work through that shows how to compute molar mass. Also has a a molar mass calculator in which you can practice problems on.

A screencast tutorial explaining how to do mathematical calculations to determine molarity. [9:14]

As part of the Amazonia exhibit at the National Zoo, this site highlights various facts and interesting information on the Naked Mole-Rat. In addition to several pictures, the site provides a description and information on habitat, diet, reproduction, and more.

In this video David Caprette, PhD, discusses the types and properties of mixtures prepared and/or encountered in a biological laboratory. He also introduces basic lab equipment, terms and concepts related to formulas, and the concept of the mole. [33:24]