Select the disease(s) caused by trypanosomes.
A. African Sleeping Sickness
B. Giardiasis
C. Leishmaniasis
D. Trichomoniasis
E. Chagas' Disease
Answer: E
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The extinction of the dinosaurs is believed to have been caused by ________
a. competition from mammals b. a natural global cooling cycle c. an asteroid impact d. disease
Two species of closely related squirrels both
feed on acorns produced by oak trees. One species feed exclusively near the top of the tree and the other feeds exclusively towards the bottom of the tree. This is an example of
a. competitive exclusion. b. resource partitioning. c. mutualism. d. commensalism. e. mimicry.
Proteins at tertiary level are reinforced by:
A. S-S bridges B. Hydrophobic interaction C. Covalent bond A. A and B B. B only C. B and C D. All of these E. A and C
What is the role of interleukins?
A) chemotaxis of leukocytes B) production of virally infected cells C) ensuring production of enough leukocytes D) signaling between leukocytes E) complement activation