Hemoflagellates cause tropical diseases such as sleeping sickness and Chagas' disease that are ALL transmitted by
A) contact with fecal contaminated soil.
B) contact with contaminated water.
C) insect vectors.
D) sexual contact.
Answer: C
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The activation of protein kinase A by cyclic AMP binding likely occurs because of:
A. the activity of a phosphatase. B. the binding of GTP. C. phosphorylation. D. a conformation change.
DNA contains an organism's genetic material, organized into sequences called:
a. genes. b. chromosomes. c. gametes. d. nuclei. e. sperm and egg cells.
Fishes that reproduce in fresh water and migrate out to sea as adults are considered:
a. catadromous. b. anadromous. c. polyandrous. d. polygynous. e. demersal.
Which of the following mutualists cannot survive without the mutualistic interaction?
A) facultative B) subordinate C) dependent D) obligate