Every major concept, key term, and definition that an AP US history student should know for a test prep session and the big exam is right here in this comprehensive, well-organized study guide. 

Transform your class' understanding of genes and antibiotic resistance with the Transformation Lab. Junior geneticists create and observe their own resistant strains of E. coli through research, discussion, and experimentation. The...

AP Biology, AP Calculus, and AP Physics online resources are provided for both teachers and students. These resources are designed to prepare high school students for their AP exams.

This is a solid review of basic principles of population genetics with an emphasis on plants. Use this to complement your units on evolution and plant biology. Take the quiz to check your understanding.

A concise, advanced level, review of structure and growth in these plant organs. Illustrations are clear and well labeled. This is an excellent tool for labs or exams.

Use this resource for an advanced discussion written in a clear an easy to follow style. There are diagrams and animations for all the major pathways.

This is a glossary of terms and definitions used in Chapter 12: Fluid Dynamics and Its Biological & Medical Applications from the AP Physics online text.

Photomicrographs and diagrams make this resource a great tool for studying reproduction and development. Use this along with your lab material on plants.

Discusses the differences between endothelial and epithelial cells, including where they are found in the human body, their function, and their structure.

Proteoglycans are a type of protein that help in maintaining the integrity of connective tissue. Their chemical structure is quite complex and is explained here with the aid of labeled illustrations. Their functions in the support of...

This is a good explanation of plant water balance issues and carbon fixing cycles. Transpiration processes are explained well with links to additional information.

A thorough discussion of the environmental cues that can trigger germination and of the changes in structure that result. Charts, graphs, and links are also provided.

A nice introduction to the idea that living things are highly organized at several different levels. Great as an introduction to biological complexity.

Describes how sperm cells are formed through the process of spermatogenesis and some factors that can negatively affect sperm formation.

A concise review of how plants sense environmental conditions and respond to stimuli. Good illustrations and a quiz enhance learning along with links to additional information.

This essay is complemented by useful illustrations of how plant cells enlarge after mitosis and become specialized for different functions. A good supplement to plant growth studies.

This advanced level essay is a concise review of the structure of woody stems and roots. Good illustrations help make the text understandable.

This is an advanced review from Palomar College of the types of cells that make up conducting tissue in stems and roots. The photos and diagrams are excellent!

The pictures in this essay from Palomar College are wonderful. The huge variety of flowering plants including some of the more unusual groups, is discussed at an advanced level.

A useful review of plant meristems, growth and cell wall construction. Good illustrations make for easy to understand information.

An introduction to these chemical families. Diagrams are easy to understand and the text explains basic concepts well.

This information can be used for exam review or as an introduction. It presents a good overview of the topics with charts, graphs, links, and a quiz.

Describes the main tissue types and organ systems of the body and how they function together.

Learn about the three types of muscle tissue, how a muscle contracts, and how muscles are adapted for exercise. [3:40]