Images
You have tens of thousands of genes in your genome. Does that mean your cells express all of those genes, all the time? Not by a long shot! Even an organism as simple as a bacterium must carefully regulate gene expression, ensuring that the right genes are expressed at the right time. Learn more about the mechanisms cells use to turn genes “on” and “off.”
Similar resources
Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computing, history, art history, economics, and more, including K-14 and test preparation (SAT, Praxis, LSAT) content. We focus on skill mastery to help learners establish strong foundations, so there's no limit to what they can learn next!
Multiplication and division
South, East, and Southeast Asia: 300 B.C.E. - 1980 C.E.
Graphing lines and slope
Home-made robots
Global prehistory: 30,000-500 B.C.E.
