These microscopes use visible light and one or ... To study the kDNA structure, scientists used topoisomerases (enzymes that make specific cuts in the DNA) to decatenate the rings.

How does your body speed up these important reactions? The answer is enzymes. Enzymes in our bodies are catalysts that speed up reactions by helping to lower the activation energy needed to start a ...

But it's possible to see things much smaller than that if we use magnification. There's three types of microscope: light, like this one here, and two types of electron microscopes, like those ones ...

We can use microscopes to look at objects too small to be seen by the naked eye. The microscope in the picture is a light microscope. It uses focused light passed through the object and two lenses ...