Wear on the edges. Shipped the next business day! We own a small family book store and sell our extra books and media that have been on our shelfs for too long. Additional Details ------------------------------ Product description: Overview A Beginner's Guide to Molecular Structures by President Sandra Porter Ph.D. Learn how to find molecular models, determine which structure to view, display structures in different ways, add annotations, and compare one structure with another. Learning genetics and biochemistry is much easier when you can really see how mutations change the shapes of structures. Engaging activities help you learn and practice what you've learned.