In this freshwater aquatic ecosystem, species composition varies along its length based on rock types, depth, oxygen
concentrations, and temperature.
a. streams
b. lakes
c. estuaries
d. coral reefs
e. hydrothermal vents
ANSWER: a
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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 entering the cholera bacterium genome and causing the bacterium's cell to lyse. B. the phage introducing a gene into the bacterium's chromosome that codes for the cholera toxin that can cause death in humans. C. the phage altering the cell wall of the cholera bacterium that produces a toxin that can cause death in humans. D. the phage alters the host cell, which permits direct entry of the cholera bacterium into the host cell leading to death in humans.
When blood oxygen decreases, what hormone increases red blood cell synthesis by stem cells in the bone marrow?
A. Erthropoietin b. Aldosterone c. Renin d. Antidiuretic hormone (ADH)
What should the arrow in the following equation be labeled? Sugar + oxygen --> carbon dioxide + water + ATP.
a. photosynthesis b. cellular respiration c. Krebs cycle d. Calvin cycle
In the "Gross National Happiness" video, the Fourth Dragon King established a new system of measuring the development of the country of Bhutan based on values and happiness. What was the final gift he gave the people of Bhutan to contribute to Gross National Happiness?
A. free healthcare system B. free education for every citizen C. democratic governance, he gave up his own sovereignty as king D. healthy family relationships E. new holidays to celebrate cultural heritage