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 matter and elements
Describe the interrelationship between protons, neutrons, and electrons
Compare the ways in which electrons can be donated or shared between atoms
Explain the ways in which naturally occurring elements combine to create molecules, cells, tissues, organ systems, and organisms

Explains how metallic bonding structure creates the different properties of metals. The electron sea model explains how the positive nuclei are locked into a negative sea of delocalized electrons. This sharing of electrons creates metals that are good conductors, malleable, ductile, and non-volatile. [5:54]

A narrated tutorial explaining the properties and characteristics of different types of chemical bonds. [5:42]

After reviewing different types of bonding, students predict the type of bond that will form between two different atoms using periodic trends and electronegativity data. [4:04]

Read about Linus Carl Pauling (1901-1994), the recipient of two Nobel Prizes, and his research into the nature of the chemical bond which earned him recognition in the world of chemistry.

Interactive video lesson discusses the distribution of electrons in a carbon atom, and then follows with a chemical investigation of plastics.

An interactive video lesson where students first determine misconceptions about what happens during chemical reactions, and then investigate some various chemical reactions.

Through this lab, students are introduced to energy sciences as they explore redox reactions and how hydrogen fuel cells turn the energy released when hydrogen and oxygen are combined into electrical energy that can be read on a standard multimeter. They learn about the energy stored in bonds and how, by controlling the reaction, this energy can be turned into more or less useful forms.