Which of the following was not present on Earth when mitochondria first evolved?
a. archaeans
b. bacteria
c. protists
d. animals
D
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Epidermal placodes are:
A. epidermal thickenings that give rise to integumental coverings such as feathers and hair B. epidermal thickenings that give rise to the lateral line system C. epidermal thickenings that lead to the formation of mesoderm D. epidermal thickenings that give rise to skin glands E. none of the choices provided
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
An imperfect flower
A. has no petals or sepals. B. contains only male or only female structures. C. is sterile. D. has accessory structures with irregular symmetry.
How does a patient typically become infected with hookworms?
A) Cysts are spread onto fomites when an infected host does not properly wash their hands and then the patient touches that object and doesn't wash their hands before eating. B) Cysts are spread via respiratory droplets when an infected host coughs or sneezes. C) Eggs are ingested when the patient eats infected seafood. D) The worm penetrates the skin when the patient walks outside barefoot. E) Cysts are ingested when the patient eats undercooked meat.