Infected animals shed Leptospira interrogans in their
A. blood.
B. urine.
C. saliva.
D. respiratory secretions.
E. feces.
Answer: B
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Evidence that cytoskeletal elements have ancient origins comes from:
A. the sequence similarities of cytoskeletal elements when comparing distantly-related organisms. B. the presence of cytoskeletal elements in both eukaryotes and prokaryotes. C. the observation that both prokaryotes and eukaryotes use cytoskeletal elements to assist cell division. D. the ability to form functional hybrid microfilaments from actin monomers taken from distantly-related organisms. E. All of these choices are correct.
Humans have 23 pairs of chromosomes; how many linkage groups are present in humans?
a. twenty-three—one group for each pair of chromosomes b. forty-six—one group for each chromosome c. two—one with the male gamete, and one with the female gamete d. Because linkage groups are formed when two or more genes are inherited together, the number is nearly infinite.
Which human organ is responsible for breaking down ethanol and other toxins?
a. stomach b. liver c. small intestine d. pancreas e. spleen
The atmospheric gas that prevents the majority of the sun's ultraviolet radiation from penetrating to the
Earth's surface is: a. methane. b. ammonia. c. oxygen. d. ozone. e. carbon dioxide