Which of the following will tend to produce adaptive changes in populations?
A) genetic drift
B) gene flow
C) natural selection
D) the founder effect
Answer: C
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A drug researcher has developed a macromolecule that can bind to scrapie and thus change the prion's conformation. What effect might this have on the actions of scrapie?
A. The shape change could prevent the scrapie protein from converting normal proteins to scrapie proteins. B. The shape change could induce scrapie protease activity. C. The shape change could stop the transcription of scrapie RNA. D. The shape change could stop the replication of scrapie DNA. E. The shape change could block the translation of scrapie RNA.
Mycorrhizae, present for most plant species, generally help roots with the uptake of all EXCEPT
a. water. b. nitrogen. c. phosphate. d. carbon. e. sugars.
Somatic cell nuclear transfer is used to create human embryos for research purposes in ____
a. embryo cloning b. embryo splitting c. therapeutic cloning d. artificial twinning e. stem cell cloning
What would happen if a mutation created a new allele that decreased fitness?
A) The new allele would spread through the population and decrease the fitness of that population. B) The new allele would decrease the fitness of the individual that possessed it, and that individual would have few or no offspring. C) The new allele would have to change back to an allele of higher fitness so the possessor of that allele could maintain its fitness. D) The individual with the new allele would wait for an environmental change so that its fitness would increase again.