A low intracellular concentration of fixed nitrogen (and high level of ?-ketoglutarate) in Anabaena activates the NtcA global regulator, which ultimately controls the activity of ________ and ________
a. nitrogen fixation / heterocyst formation
b. photosynthesis / endospore formation
c. nitrogen fixation / endospore formation
d. photosynthesis / heterocyst formation
Answer: A
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