Thiobacillus oxidizes inorganic sulfur compounds and reduces CO2. This bacterium is a
A) chemoheterotroph.
B) chemoautotroph.
C) photoautotroph.
D) gammaproteobacteria.
E) photoheterotroph.
B
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In subarctic saltmarshes, scientists have found that the addition of calcium has no effect on productivity, but additional iron does increase productivity. In this example, iron
A. is a precursor to calcium. B. stimulates evapotranspiration. C. biomagnifies in the marsh plants. D. is a limiting factor. E. blocks the effect of calcium.
In echinoderms, gastrulation takes place through a(n) primitive groove. Indicate whether the statement is true or false
Based on current hypotheses, the prokaryotic group that gave rise to eukaryotes is the ________
Fill in the blank(s) with correct word
Over 470,000 cases of cholera were reported in Haiti in the two years following the 2010 earthquake. Which of the following was the most likely mode of transmission?
A) mosquitoes B) aerosols C) contact D) contaminated water E) contaminated milk