Nutrient recycling in the marine environment is performed by:
a. cyanobacteria.
b. heterotrophic bacteria.
c. autotrophic bacteria.
d. purple bacteria.
e. sulfur bacteria.
B
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A failure or delay of an appropriate immune response is termed
a. autoimmunity. b. cell-mediated immunity. c. immunodeficiency. d. adaptive immunity.
When a gene from one species is transferred into another species, the result is ____
a. a GMO b. a new species c. a hybrid animal d. eugenics e. a lethal mutation
The face of a sunflower turns to follow the sun as it moves across the sky. This is an example of
A. homeostasis. B. reproduction. C. metabolism. D. response to stimuli. E. development.
A population's gene frequency should NOT change if ______________.
a. the population is large b. there is random mating c. there is no natural selection d. all of these