Modern humans have been in existence for approximately how many years?
A) 200,000 B) 100,000 C) 500,000 D) 1,000,000
Answer: A
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If pyruvate oxidation is blocked, what will happen to the levels of oxaloacetate and citric acid in the citric acid cycle shown in the accompanying figure?
A) There will be no change in the levels of oxaloacetate and citric acid. B) Oxaloacetate will decrease and citric acid will accumulate. C) Oxaloacetate will accumulate and citric acid will decrease. D) Both oxaloacetate and citric acid will decrease. E) Both oxaloacetate and citric acid will accumulate.
In warm areas, salt is extracted from seawater by:
a. evaporation. b. freezing. c. reverse osmosis. d. chemical methods. e. filtration.
Which one of the following is not an alveolate:
1.coccolithophores 2.dinoflagellates 3.ciliates 4.apicomplexans
Four of the five choices listed below are possible
causes of extinction. Select the exception. a. asteroid impact b. conservation c. tectonic change d. human activity e. climate change