Curated OER
Hydroponics
These attractive, clear slides summarize hydroponics. They cover details concerning nutrients, solutions, flooding issues, media types, and commercial use.
Curated OER
Enzyme Action
Students work with models of substrates and of enzymes and test the digestion of lactose with lactase. They determine if digestion of lactose has or has not occurred.
Curated OER
Toothpick Breakdown
Fourth graders model the activity of an enzyme acting on a substrate and observe relationships. Have students place toothpicks in a pile. One member of the team should break as many toothpicks as possible, in 10 seconds.