What does it mean to say that experimental conditions are controlled?
a. The test groups consist of the same individuals.
b. The null hypothesis is correct.
c. There is no difference in outcome between the control and experimental treatment.
d. All physical conditions except for one are identical for all groups tested.
Answer: d. All physical conditions except for one are identical for all groups tested.
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Pertussis has all of the following characteristics except
A. DTaP immunization will prevent it. B. the early stage resembles a cold with nasal discharge and sneezing. C. transmission is by respiratory droplets. D. the catarrhal stage has persistent, hacking coughs with "whoops." E. the pathogen has virulence factors to destroy the action of respiratory cilia.
Which of the following is least likely to be a cause of extinction?
a. asteroid impact b. human activity c. adaptive radiation d. continental drift e. climate change
A hormone used by competitive athletes to increase the oxygen-carrying capacity of their blood is
_____________. A. oxytocin D. norepinephrine B. glucagon E. serotonin C. erythropoietin
Which of the following can be used to isolate pure cultures of bacteria from mixtures?
A. Streak plates B. Pour plates C. Spread plates D. All of the choices are correct.