What phrase best describes the field of epidemiology?
A. It is the study of factors that control the presence or absence of disease.
B. It is the study of infectious disease.
C. It is a direct and experimental science.
D. It begins with laboratory studies on experimental animals.
E. It is none of these.
A
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The process by which white blood cells ingest and kill bacteria is called
A) exocytosis. B) transcription. C) phagocytosis. D) translation.
The most primitive of the current reptiles based upon
the time of divergence from the stem reptiles are the a. crocodiles. b. snakes. c. tuataras. d. lizards. e. turtles.
Forty-nine percent of a population is homozygous dominant for a particular trait. According to the Hardy-Weinberg law, the gene frequency of this dominant allele will be
A. 0.24. B. 0.49. C. 0.70. D. 0.9.
Botulinum toxin- A toxin produced by the bacterium Clostridium botulinum.Known for sometimes lethal poisoning from infected meat products. In modern controlled medical or cosmetic use, the very same toxin is known as Botox.Tetanus toxin- Another very potent neurotoxin produced by Clostridium tetani.Strichnine- A highly poisonous alkaloid produced by the Strychnos nux-vomica tree,historically used to kill rats and other pests.You accidentally consume botulinum toxin by eating a contaminated can of sausages. What do you predict will be the most harmful physiological effect?
A. Pupil dilation B. Respiratory failure due to flaccid paralysis (relaxed muscles) C. Slowed action potential conduction D. Respiratory failure due to spastic paralysis (constant muscle contraction)