Which prime-time soap opera was a spin-off of 'Beverly Hills, 90210'?

In 'Bonanza', what is the name of the Cartwright family ranch? In 'Dallas', what is the name of the Ewing family ranch? In 'Dynasty', which actress played Alexis Colby? In 'Knots Landing', from which show did the series spin off? Which daytime soap opera debuted on NBC in 1965 and is known for its hourglass opening? Which soap opera is set in the fictional town of Port Charles? Which soap opera is set in the fictional town of Genoa City? Which late-night show did Conan O'Brien host from 1993 to 2009 on NBC?