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.
TransLink says the capital cost of building park-and-rides ranges from $3,000 to $16,000 per space, while the operating costs are $200 to $800 per year. We encourage an open exchange of ideas on this story's topic, but we ask you to follow our guidelines for respecting community standards.