Essay on the Principle of Population, written by Thomas Malthus in 1798, influenced Darwin's thoughts as he struggled to understand what mechanisms could be at work to produce evolution. Malthus proposed that populations of animals and plants, including humans,
A. evolved from mainland to islands, thus explaining why the island flora and fauna resembled the mainland species so closely.
B. decreased arithmetically in numbers while the nutrients available increased geometrically.
C. increased arithmetically in numbers while the nutrients available only increased geometrically.
D. increased geometrically in numbers while the nutrients available only increased arithmetically.
E. increased geometrically in numbers while the nutrients available increased arithmetically.
D
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A high school student in Nepal is accepted—and eventually attends—college in the United States. His diet goes from one that is rich in vegetables and grains to one that primarily consists of meat and sugars
What will happen to the bacterial composition of his intestines? A. There will be more Firmicutes inhabiting his intestinal tract. B. There will be more Bacteroidetes inhabiting his intestinal tract. C. Nothing will happen; there is no relationship between bacteria in the intestines and diet. D. Bacteria will no longer inhabit his intestines.
Most fungi require __________ and are therefore __________
a. carbon dioxide; aerobic b. carbon dioxide; anaerobic c. oxygen; aerobic d. oxygen; anaerobic
Arrange the events in the pathway activated by G-protein-coupled receptors (GPCRs) in the correct order
1. Activation of effector 2. Activation of protein kinases 3. Receptor binds first messenger 4. Production of second messenger 5. Activation of G protein
a. 1?3?5?2?4 b. 2?3?5?4?1 c. 3?1?5?4?2 d. 3?5?1?4?2 e. 3?5?2?4?1
Sea creatures which are adapted to life at the bottom of the ocean reside ____.
A. in the pelagic zone B. in the intertidal zone C. in the neritic zone D. near hydrothermal vents E. in the benthic province