Which of the following is caused by a member of the rickettsias?
A. Typhoid fever
B. Rocky Mountain spotted fever
C. Q-fever
D. All of the choices are correct.
Answer: B
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Genetically modified food has raised some concerns because
A. it contains radioactive particles. B. it may contain some unanticipated allergens. C. it may have some unintended environmental effects. D. the modified DNA may transfer to other organisms. E. it may contain some unanticipated allergens, it may have some unintended environmental effects, AND the modified DNA may transfer to other organisms.
What is the ?2 value for a chi-square test for goodness of fit of the null hypothesis?
In Drosophila, singed bristles (sn) and carnation eyes (car) are both caused by recessive X-linked alleles. The wild-type alleles (sn+ and car+) are responsible for straight bristles and red eyes, respectively. A sn car female is mated to a sn+car+ male and the F1 progeny are interbred. The F2 are distributed as follows:
A) 0.5
B) 1.0
C) 2.0
D) 0.4
E) 20
The scientist given credit for first using the term "cell" to describe the basic unit of life using spun glass lenses is
A. Rudolf Virchow. B. Louis Pasteur. C. Theodore Schwann. D. Robert Hooke. E. Antony van Leeuwenhoek.
The therapeutic range of an antimicrobial is the
A) ratio of the dose a patient can tolerate to the effective dose. B) range of microorganisms the antimicrobial effects. C) range of concentrations at which the antimicrobial is both effective and non-toxic. D) ratio of the concentration of antimicrobial in the blood to the oral dose. E) length of time the medication persists in the body after a single dose.