The abyssal plains are formed of ________.
A. volcanic ash
B. sediment from meteoric dust
C. pillow basalts
D. mid-oceanic ridges
E. horizontal layers of sediment
Answer: E
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A mutation in which one nucleotide is substituted for another is called a
A. point mutation. B. frameshift mutation. C. nonsense mutation. D. none of the above
In developing countries, demographic transition is least likely to be hindered by ____.
A. environmental degradation B. extreme poverty C. resource depletion D. a drop in economic assistance from developed countries E. an increase in education opportunities for women
The chemical formula of hydrogen cyanide is HCN. How many unshared electrons are associated with a molecule of hydrogen cyanide?
A) 2 B) 4 C) 6 D) 10
Normal kidney function involves which of the following?
A) filtration in which large molecules are lost but small molecules are retained B) reabsorption of some small molecules from the urine C) both a and b D) neither a nor b