Eukaryotic cells regulate the expression of multiple genes by having ____
a. individual activators for individual genes
b. a few activators that can interact with small subsets of genes
c. activators that serve as catalysts for further activator protein synthesis
d. a few activators that work in different combinations to activate different genes
e. a single activator that undergoes modifications to enable interaction with different promoters
ANSWER: d
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Which statement best summarizes the results of the experiment by Damschen and her colleagues on the effect of
landscape corridors on species richness?
a. Habitat patches with landscape corridors are at higher risk of encroachment by exotic species than are isolated habitat patches. b. Over time, the number of native species harbored by habitat patches with landscape corridors was increasingly greater than in isolated habitat patches. c. The number of both native and exotic species increased over time in habitat patches that were connected by landscape corridors. d. The number of native species increased over time in isolated habitat patches but not in those connected by corridors. e. The number of exotic and native species decreased in patches connected by landscape corridors.
Acid rain is the result of ____
a. the burning of fossil fuels b. the greenhouse effect c. contamination with CFCs d. desertification e. deforestation
A complete cycle of contraction and relaxation of muscle cells due to stimulation by a motor neuron is called a muscle ________
Fill in the blank(s) with correct word
When one species evolves a new phenotypic feature and another species evolves new adaptations in response, it is called
A) gene flow. B) genetic drift. C) sexual selection. D) stabilizing selection. E) coevolution.