Tracers allow scientists to track a molecule through a biochemical process by replacing an atom in that molecule with its _________.
Fill in the blank(s) with the appropriate word(s).
radioisotope
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Fungal cell walls are composed of what material?
A. Chitin B. Cellulose C. Peptidoglycan D. Lignin E. Glycogen
The prevalence of the allele for sickle cell anemia in some populations is an example of?
A. Heterogeneous environments B. Balancing selection C. Inverted selection D. Non-Darwinian selection E. Nonrandom mating
In polymerase chain reaction technology, the two strands of DNA are separated by:
a. gel electrophoresis. b. treatment with restriction enzymes. c. centrifugation. d. exposure to high pH. e. exposure to heat.
Which of the following observations provides the best experimental evidence that populations diverge during allopatry?
a) Hybrid offspring of cold-adapted and saline-adapted genotypes were more viable than purebred offspring. b) Hybrids of offspring cold-adapted and saline-adapted genotypes were less viable than purebred offspring. c) Exposure to cold enabled populations to evolve better performance at low temperatures. d) Exposure to salt enabled populations to evolve better performance at high salinity.