Spiders breathe by means of
a. Gills
b. Diffusion across the soft cuticle
c. An extensive system of tracheae more complex than is found in insects
d. Book lungs or primitive tracheae
e. Coxal glands
Answer: e. Coxal glands
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The antimicrobial action of artemisinin is not well understood but this chemical appears to
A. raise the internal pH, clump the plasmodial pigment, and intercalate into plasmodial DNA. B. form reactive oxygen intermediates inside Plasmodium-infected red blood cells. C. inhibit heme polymerase, an enzyme that converts toxic heme into nontoxic hemazoin. D. swell the Plasmodium falciparum food vacuoles.
A disease that can be caused by mutations in different genes is said to have homogeneity
Indicate whether the statement is true or false
Latent infections are those that:
a. develop and progress slowly. b. develop quickly and end soon. c. exist as a silent phase in which the agent is causing no notable effect. d. develop quickly but last long.
Epidemiology is the study of disease in individuals.
a. true b. false