We can conclude that natural selection must have acted in favor of large brains in humans because:
A. we have large brains in proportion to our
body size compared to other mammals.
B. large brains have allowed us to dominate
the planet.
C. large brains are metabolically expensive to
produce and maintain.
D. we would not have large brains if natural
selection did not favor them.
E. None of the answer options are correct.
C
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Which of the following statements regarding the phosphorus cycle is incorrect?
A. The phosphorus pool is in sedimentary rock. B. Phosphorus must be phosphatized to enter biological systems. C. Phosphorus is released naturally by mining. D. Phosphorus mineralization occurs by microbial action. E. Thiobacillus produces sulfuric acid that dissolves phosphate rock.
As the global concentration of carbon dioxide increases, there is great potential for direct impact on the world's
A. climate. B. biodiversity. C. biogeochemistry. D. ozone layer.
What kind of bond holds two water molecules to each other?
A) hydrogen bonds B) ionic bonds C) nonpolar covalent bonds D) polar covalent bonds
Which of the following is the correct sequence of PCR?
A) Heat to 90°C (to separate DNA), then cool to 50°C (to bind primers and enzymes), and then reheat to 70°C (to synthesize DNA). B) Heat to 90°C (to bind primers and enzymes), then cool to 50°C (to separate DNA), and then reheat to 70°C (to synthesize DNA). C) Heat to 70°C (to bind primers and enzymes), then cool to 50°C (to synthesize DNA), and then reheat to 90°C (to separate DNA). D) Heat to 70°C (to separate DNA), then cool to 50°C (to bind primers and enzymes), and then reheat to 90°C (to synthesize DNA).