Postzygotic reproductive isolation prevents
A. fertilization.
B. formation of gametes by one of the parents.
C. male gametes from joining with female gametes.
D. All of the answer choices are correct.
E. genetic exchange between populations by selecting against hybrid offspring.
E. genetic exchange between populations by selecting against hybrid offspring.
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Which of the following chemical differences contribute to increased structural variety of RNA over DNA?
A. In addition to the double-stranded regions, virtually all of the unpaired bases are involved in base stacking interactions, increasing the variety and stability of RNA. B. Since RNA molecules have no pucker the sugar molecules are flat and can add to stacking stabilization. C. Base stacking contributes less to RNA stability because fewerbases are paired. D. Because ribose has one less hydroxyl group there are fewer opportunities for RNA to hydrogen bond. E. Different sugar puckers cause the phosphates in the RNA backbone to be farther apart.
Red imported fire ants are an invasive species in United States. How have they harmed the Texas horned lizard, which feeds on native ants?
a. They act as parasites on the lizards. b. They are poisonous to the lizards. c. They damage the lizard's breeding area. d. They increase the amount of predatory birds, which eat lizards. e. They have replaced many native ant populations, so the lizards have less food.
A solution having a pH of 8 is slightly acidic
__________________ Indicate whether the statement is true or false.
If the doctor says you have a middle ear infection, which of the following could be involved?
A) Auditory tube B) Cochlea C) Vestibular apparatus D) Pinna