Giardia cysts are able to withstand
A) chemical disinfection.
B) filtration.
C) clarification.
D) chemical disinfection, filtration, and clarification.
Answer: A
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What is the hypothetical result of different mutations accumulating in different populations?
A. the evolution of different species B. the extinction of one population C. merging the populations through migration D. fixation of the same alleles in both populations E. decreased genetic isolation
A mouse gene was identified and determined to be required for formation of heart muscle. A gene with a similar sequence was identified in the human genome. What experiment could scientists do to determine if the mouse and human genes have similar functions?
A) The scientist could search the human genome for genes that encode proteins that are identical to the protein encoded by the mouse gene. B) The scientist could place the normal human gene into normal mice and see if the resulting mice are viable. C) The scientist could place the normal human gene into mutant mice to see if heart muscle forms in the mouse. D) The scientist could place the mutant mouse gene into humans to see if humans develop without heart muscle.
Humans with mutations in the gene encoding AQP1 (aquaporin-1) that cause the absence of AQP1are
characterized by an inability to ____.
a. concentrate urine despite prolonged thirsting d. control sweating b. control edema e. salivate c. make large volumes of dilute urine
How many different species of organisms do scientists believe exist on earth today?
A. 10 million B. 1.5 million C. 1 billion D. 10,000