Lecture Biology: Concepts and connections, chapter 3 - The molecules of cells. The main contents of this chapter include all of the following: Introduction to organic compounds, carbohydrates, lipids, proteins, nucleic acids. | Chapter 3 The Molecules of Cells PowerPoint Lectures for Biology: Concepts & Connections, Sixth Edition Campbell, Reece, Taylor, Simon, and Dickey Lecture by Richard L. Myers Copyright © 2009 Pearson Education, Inc. Introduction: Got Lactose? Most of the world’s population cannot digest milkbased foods – They are lactose intolerant, because they lack the enzyme lactase This illustrates the importance of biological molecules, such as lactase, to functioning living organisms Copyright © 2009 Pearson Education, .