In biology, the active site is the region of an enzyme where substrate molecules bind and undergo a chemical reaction. The active site consists of residues that form temporary bonds with the substrate (binding site) and residues that catalyse a reaction of that substrate (catalytic site).
Seattle is rolling out 11 rainbow crosswalks in Capitol Hill this week, adding a colorful bang to the annual Pride celebration. The crosswalks cost the city $66,000, said Seattle Department of Transportation spokesman Rick Sheridan, and are permanent.
There is no cost to cross the bridge on the roadway. The road is public. However, you need to pay to enter the Tower Experience. The cost (at the time of writing) is Â£8 for adults, Â£3.40 for children (5-15) and Â£5.60 for students. Admission is included for free with the purchase of the London Pass.