The region of the earth inhabited by living organisms is called the
A. niche.
B. ecosystem.
C. community.
D. biosphere.
D. biosphere.
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Which of the following is the most common systemic fungal disease in the United States?
A) cryptococcosis B) coccidioidomycosis C) histoplasmosis D) Pneumocystis pneumonia
ATP is called a cell's energy "currency" because
A.) ATP catalyzes all metabolic reactions. B.) ATP allows one organelle to be exchanged for another between cells. C.) glucose is made of ATP. D.) ATP can be "made" in one place and "spent" or used in another.
Efflux pumps can be used to pump antibiotics out of a cell once they enter to protect the cell. This will be done against the concentration gradient of the antibiotic. Which of the active transports would most likely be used?
a. Symport b. Antiport c. Uniport
In an aquatic ecosystem, a secondary carnivore is temporarily excluded and then, after a period of time, is returned. Which one of the following is NOT an expected top-down effect after it is returned?
A. Algae decrease. B. Primary carnivores become less abundant. C. Primary productivity increases. D. Herbivores become more abundant.