Cancer is a disorder in which some cells have lost the ability to control their
A. volume.
B. surface area.
C. size.
D. spindle fibers.
E. rate of cell division.
Answer: E
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Analyses of sulfur isotopes have been used as evidence against life on the Moon, because the sulfides in lunar rocks have
A) an isotope composition similar to marine sulfate, which is enriched in 34S. B) an isotope composition similar to marine mud, which is depleted in 34S. C) an isotope composition similar to igneous rocks. D) exactly equal amounts of 34S and 32S.
Consider the following reaction at equilibrium: CO2 + H2OH2CO3. (see diagram) What would be the effect of adding additional H2O?
A) It would drive the equilibrium dynamics to the right. B) It would drive the equilibrium dynamics to the left. C) Nothing would happen because the reactants and products are in equilibrium. D) Reactions in both the directions will slow down.
Scientists have demonstrated that the cholera bacteria, Vibrio cholerae, can exist as a rather harmless form or, by phage conversion, can exist as a disease-causing, virulent form. This conversion is caused by
A. the phage alters the host cell, which permits direct entry of the cholera bacterium into the host cell leading to death in humans. B. the phage altering the cell wall of the cholera bacterium that produces a toxin that can cause death in humans. C. the phage introducing a gene into the bacterium's chromosome that codes for the cholera toxin that can cause death in humans. D. the phage entering the cholera bacterium genome and causing the bacterium's cell to lyse.
Which of the following organisms is a prokaryote?
A. algae B. archaea C. fungus D. protozoa E. both archaea and protozoa