The oceans represent an important sink for anthropogenic CO2. In what form is the excess carbon stored?
A) as calcium carbonate sediments
B) as solid methane
C) as CO2 dissolved in water
D) as atomic carbon coatings on inorganic particulates
E) none of the above
Ans: A) as calcium carbonate sediments
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Identify the stage of cellular respiration where glucose is split into two molecules of pyruvic acid.
A. Calvin cycle B. Electron transport chain C. Citric acid cycle D. Glycolysis
In the figure, when new viruses are being assembled at the point marked IV, what mediates the assembly?
A) host cell chaperones B) assembly proteins coded for by the host nucleus C) assembly proteins coded for by the viral genes D) viral RNA intermediates E) nothing; they self-assemble
If the out-of-Africa hypothesis of human origins is correct, which of the following best describes the pattern of hominin migration from Africa?
A. H. ergaster migrated 2 million years ago; H. sapiens migrated 200,000 years ago. B. H. sapiens migrated once 2 million years ago and again 200,000 years ago. C. H. ergaster migrated once 2 million years ago and again 200,000 years ago. D. H. neanderthalensis migrated once 1.3 million years ago and H. sapiens migrated 200,000 years ago. E. H. heidelbergensis migrated 2 million years ago and H. sapiens migrated 200,000 years ago.
Which process is performed by bacteria in mutualistic relationships with legumes?
a. ammonification b. biological magnification c. denitrification d. nitrification e. nitrogen fixation