Briefly explain the iron-sulfur world hypothesis and identify two pieces of evidence that support this
hypothesis. What will be an ideal response?
The iron sulfide hypothesis states that early polymerization leading to the origin life occurred in
cracks of the deep ocean floor that released hot water, carbon dioxide and minerals such as iron and
sulfide . Laboratory simulations of these hydrothermal vents have produced organic compounds by
iron and nickel sulfide catalysis of carbon monoxide and hydrogen sulfide.
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Which of the following statements about freshwater bony fish is false?
A. They drink water to replenish water supplies. B. Chloride cells in the gills actively pump chloride ions into the body. C. They are osmoregulators. D. They tend to gain water through osmosis. E. They maintain body fluid solute concentrations that are higher than that of the surrounding water.
Over a span of two decades, scientists measured changes in the beak size of a population of Galápagos ground finches. This ________
A) provided evidence of natural selection in action B) is an example of artificial selection C) is an example of overproduction D) led Darwin to his theory of evolution through natural selection
What can you conclude from these data?
A) Sample 1 is likely from tissue in the middle of the plant because most cells are in interphase. B) Sample 2 is likely from tissue in the middle of the plant because there are fewer cells in telophase than are in prophase C) Sample 2 is likely from tissue in the middle of the plant because fewer cells are in any mitotic stage. D) Sample 1 is likely from tissue in the middle of the plant because fewer cells are in any mitotic stage than in sample 2.
What is the minimum number of phage that can initiate the development of a plaque in a bacterial lawn?
A. 1 B. 5 C. 25 D. 10