How can bacteria sense each other: bio luminescence.

Vibrio fisheri are a marine gram negative bacterium and they live symbiotically with marine animals like the squid below. However these glowing bacteria are only found bio illuminating in a large enough colony....

What is a restriction enzyme

This image is a cartoon rendition of the EcoRI restriction enzyme. Two catalytic magnesium ions are shown as magenta spheres and are adjacent to the cleaved sites in the DNA made by the enzyme (depicted as gap...