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HIV Protease Inhibitors

Labs & Demos

This demonstration models how the HIV protease enzyme functions and how its activity is blocked by a class of anti-HIV drugs.
Viral DNA Integration

Labs & Demos

In this hands-on activity, students model how a double-stranded DNA copy of the HIV genome is integrated into the host cell DNA.
HIV Reverse Transcription and AZT

Card Activities

Students model how the anti-HIV drug AZT (azidothymidine) interferes with the process of viral replication.
HIV Receptors and Co-receptors

Labs & Demos

This demonstration models the first step of the HIV life cycle: the binding of HIV envelope proteins to receptors on human helper T cells.
How We Get Our Skin Color Interactive

Interactive Videos

(3 min 32 sec) This interactive animation about the biology of skin color provides stop points at which students can further explore the material through additional text and illustrations, videos, questions, and simple interactive widgets.
Lactose Intolerance: Fact or Fiction

Lessons

In this activity, students evaluate and discuss statements about the evolutionary relationship between milk consumption and lactose tolerance discussed in the short film Making of the Fittest: Got Lactase? The Co-evolution of Genes and Culture.
Lactose Digestion in Infants

Animations

(53 sec) The lactase enzyme is produced in the small intestine of infants. It digests lactose by breaking it into glucose and galactose.
Diet and the Evolution of Salivary Amylase

Lessons

This activity engages students in analyzing authentic scientific data that explore the effects of different diets on the evolution of an enzyme that breaks down starch.
Signal molecules trigger transcription factors

Animations

(2 min 4 sec) Varying concentrations of a signaling molecule activate different transcription factors and determine cell fate.