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Read articles, including Science News stories written for ages 9-14, on the SNK website.
Flip-flopping forms

As an enzyme (blue) shifts its shape, its fit with a substrate molecule (green) shifts too, changing the enzyme's ability to drive a reaction. Frequent changes translate into more variability in reaction rate than the Michaelis-Menten equation takes into account. But the average rate is in line with the equation. Credit: T. Dube

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