The ABC genes in the model of Arabidopsis flower development are organ-identity genes that are also:a
segmentation genes.
b. homeotic genes.
c. gap genes.
d. translation factors genes.
e. growth factor genes.
b
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In Tilman's experiments with diatoms, what was the outcome when the two species competed for silica?
A) Both coexisted. B) Both survived several years but one eventually won out. C) One outcompeted the other to extinction. D) Both died.
Which of the following would contribute to a negative feedback loop that would reduce atmospheric CO2?
A) increased terrestrial NPP B) decreased terrestrial NPP C) increased CO2 emissions D) decreased oceanic NPP
The NADPH required for the Calvin cycle comes from
A) reactions initiated in photosystem I. B) reactions initiated in photosystem II. C) the citric acid cycle. D) glycolysis. E) oxidative phosphorylation.
Match the cause with the disorder.
A. albinism B. Down syndrome C. red-green color blindness D. hemophilia A E. Turner syndrome