What is the nature of the genetic mutation that causes lactose intolerance?
A. It is a dominant mutation that prevents lactase production.
B. It is a dominant mutation that causes a decline in adult lactase levels.
C. It is a recessive mutation that prevents lactase production.
D. It is a recessive mutation that causes a decline in adult lactase levels.
E. It is an X-linked mutation that prevents lactase production.
D
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The serine pathway and ribulose monophosphate pathway can both be used by ________ as a way to incorporate carbon into biomass
A) acetogens B) anoxygenic hydrocarbon fermenters C) methanogens D) methylotrophs
Following their respective breeding seasons, several species of hummingbirds occur at the same locations in North America and several hummingbird flowers bloom simultaneously in these habitats. These flowers seem to have converged to a common morphology and color. Birds have the most visual sensitivity to the color red. Following their breeding season, these species of hummingbirds are
A. allopatric. B. sympatric.
Invasive species are introduced by humans to new geographic locations and:
A) are successful in colonizing a novel area. B) spread because they encounter none of their natural predators. C) All of the choices are correct. D) can outcompete and displace native species for biotic and abiotic resources. E) are usually considered pests by ecologists.
Nitrogen fixation results in the production of atmospheric nitrogen gas (N2)
Indicate whether the statement is true or false