How well do you know your acids and bases? This resource will access your understanding and provide tutorials to help you with areas of weakness.

Tutorial on DNA basics that goes along with an online quiz over the material. Use the naviagation buttons at the bottom of the page to go to the quiz over the material.

Great overview of cell membranes. The site presents the information as a tutorial with multiple choice questions to guide the learner. Very well designed site on cell membranes.

How well do you know the relationship between enzymes and activation energy? This resource provides you with short quizzes and tutorials to provide feedback for those topics you don't understand.

Use this resource to discover the basic structure of a eukaryotic cell and some of the organelles it contains.

This explanation of genetic drift is straightforward and easy to understand. Illustrations are provided to help visual learners

If you want an interactive way to practice karyotyping, this is it. There are three patient histories and karyotypes to use in diagnosing human genetic disorders. There is enough information on comparing chromosomes to get you started.

A brief overview of the prokaryotes. The resource contains some interesting facts that will help you understand the great contrast that exists in the prokaryotic way of life.

A great site for understanding Amino Acids, the building blocks for protein. Besides a very complete summary, the site includes a complete list of amino acids, a link to basic amino acid structure, a list if atoms in amino acids, and links to test yourself. Very informative!

The Cell Biology Project at the University of Arizona provides an explanation of mitosis, DNA basics, diagrams and a practice exercise.

Poses and answers the question, "What is (and is not) mitosis?" An overview with images of the phases of mitosis, plus a mitosis animation.

Superior site for information on cell signaling. Information provided as a tutorial with multiple choice questions to guide the learner. The site has lots of images and diagrams.

Complete descriptions of microtubules and microfilaments. Flip to the following pages to go through a cytoskeleton tutorial with graphics of cross-sections and diagrams. You can test yourself at the end.

This site from the University of Arizona runs a two-step simulation of Genetic Drift. There are teacher's notes included. A great site to aid in understanding Genetic Drift.

If you want to check your understanding of immunology, this is the place to go. This resource has 13 different questions to test your knowledge, as well as tutorials that go with each question.

Great learning exercises to check your understanding of the kidneys. Complete this problem set and if you miss an answer you are taken to a tutorial that is very useful. This is a good site to use for research as well as checking for understanding.

This cell biology lesson explains and illustrated the different phases of meiosis. Includes vocabulary and assessment links as well as othe related resources.

Online mitosis activity offers the student the opportunity to identify, classify, calculate, and graph the phases of mitosis. Explanations of each phase, actual cells are displayed for classifing and gathering data in this comprehensive tutorial.

Problem set tests understanding of Photosynthesis by providing multiple choice questions accompanied by related tutorials. Set 2 Focuses on carbohydrate synthesis.

Problem set tests understanding of Photosynthesis by providing multiple choice questions accompanied by related tutorials. Problem set 1 focuses on light and role of pigments.