Statistical associations, biologic credibility, sequence of events, and consistency among studies are all ways epidemiologists establish casual associates
a. true
b. false
Ans: a. true
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Sex chromosomes are ____
a. completely different between the two sexes b. partially homologous but also have unique regions c. found only in males d. unable to line up properly at the metaphase plate e. completely homologous but always have different alleles
As energy passes through a food chain, approximately ____ percent is lost as it passes through each trophic level.
A. 10 B. 25 C. 50 D. 90
Nondisjunction is the process
A. in which homologous chromosomes fail to segregate normally. B. in which abnormal cytokinesis occurs. C. in which metaphase is not allowed to occur. D. described by two of these statements.
Which of the following is required for transposition?
A) F+ plasmid B) bacteriophage C) insertion sequence D) donor cell E) competence