See how a knee-jerk reflex depends on a simple circuit of proprioceptive sensory neurons and spinal motor neurons. [1:21]
An up-close look at bacteria. [0:52]
In this narrated animation, watch the dengue virus undergo RNA replication and protein transcription as it matures inside a human cell ultimately causing the infectious disease. [4:12]
Resource offers a great explanation and animation of the processes of active and passive transport across cell membranes. Requires Adobe Flash.
In this animation, a molecular menagerie of small molecules is displayed, with two particular molecules singled out for attention: rapamycin and furrowstatin. [1:57]
A close-up look at the fossil records of the stickleback fish. [1:26]
A close-up look of the fertilization of the C. elegans oocyte. [1:12]
Discover how wing spots are involved in fruit fly courtship. [0:55]
Creatures seen by Charles Darwin. [0:24]
The Double Helix is the story of the scientists and evidence involved in one of the most important scientific quests of the 20th century: the discovery of the structure of DNA. [16:53]
Discover how birds descended from dinosaurs. Learn about the evidence scientist are uncovering to find out about the origin of birds. Throughout the video, there are embedded quiz modules that test students' understanding. [18:59]
This video/slideshow provides an explanation that explains how greenhouse gases that cause further warming. [2:14]
This video/slideshow helps you discover exactly how HIV infects a cell and replicates itself using reverse transcriptase and the host's cellular machinery. [4:52]
A brief video explaining the origins of the HIV virus. [1:12]
A brief video explaining mosquito control in Nicaragua. [1:01]
A look inside the birth and life of a tumor. See how the growth begins, and how blood vessels form to support the tumor. [1:12]
This is an interactive video that describes the factors that affect our skin color. There are five points in the video where students can pause the video to learn further information about the concepts discussed. [3:32]
This slideshow helps you discover the beginning of embryonic development and how it is fertilized, how it grows, and how it, in turn, becomes a pregnancy. [2:18]
A close-up look of an Intracytoplasmic Sperm Injection. [1:25]
A quick video clip that shows the lactase enzyme produced in the small intestine of infants. It digests lactose by breaking it into glucose and galactose. [0:53]