Which of the following species, all of which are involved in step 2 of the citric acid cycle, is optically active?
A) cis-aconitate
B) citrate
C) isocitrate
D) none of them
C
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Science
a. is a study of the history of the natural world b. attempts to discover order in nature to interpret the past c. is best described as a random collection of facts d. is supported by small amounts of evidence e. is an endeavor to discover how nature works
The earth's biodiversity is determined by the balance between ____.
A. geographic isolation and reproductive isolation B. speciation and extinction C. mass extinction and background extinction D. speciation and genetic engineering E. reproductive isolation and extinction
At Hebgen Lake in 1959 an earthquake larger than magnitude 7 greatly affected ________.
A. Yellowstone National Park B. Denali National Park C. Grand Canyon National Park D. Yosemite National Park E. Olympia National Park
Planetary scientists have successfully explored Mars using
A. landed rovers. B. orbiting spacecraft. C. sophisticated cameras. D. All of these choices are correct.