One reason that malaria continues to be the world's most significant infectious disease is because Plasmodium falciparum continues to develop resistance to the drugs that have been used to treat malaria. Which of the following is the contributing factor to its resistance?
A. The antimalarial drugs cause mutations to occur in the mosquito.
B. Some Plasmodium falciparum have preexisting mutations that make them resistant to antimalarial drugs.
C. Some mosquitoes have preexisting mutations that make them resistant to antimalarial drugs.
D. The antimalarial drugs cause mutations to occur in Plasmodium falciparum.
E. Some people have preexisting mutations that make them resistant to antimalarial drugs.
B. Some Plasmodium falciparum have preexisting mutations that make them resistant to antimalarial drugs.
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A ________ is a piece of extrachromosomal DNA that has its own replication origin.
Fill in the blank(s) with the appropriate word(s).
Which of these diseases would most likely be identified by viewing a stained blood smear in a light microscope?
A. Ebola hemorrhagic fever B. Dengue fever C. HIV D. Chagas disease
Convergent evolution often produces structures that are homologous but NOT analogous.
a. true b. false
If a plant is living under conditions that limit root growth, shoot growth is
A) limited as well, due to more auxin being produced by the apical meristem. B) unaffected by the amount of root growth. C) stimulated, due to more auxin being produced by the apical meristem. D) stimulated, due to less cytokinin being produced by the root. E) limited as well, due to less cytokinin being produced by the root.