Which German-born biochemist discovered the citric acid cycle of metabolism and energy production?

Alphabetically, which noble gas comes last? Alphabetically, which planet in our solar system comes last? What is the alphanumeric name of the most popular of three audio encoding layers in an MPEG standard released in 1993? Which author, already a successful poet, began his career as a novelist in 1814 with a tale of the Highlands? Al Gore's 1992 book on the environment was titled "___ in the Balance"? Alsace-Lorraine was annexed by Germany as a result of which 1870-71 war? Which word names both a magazine founded in 1923 and something said to be "of the essence"? German actor Gert Frobe played the title villain in which 1964 James Bond film?