56. In this diagram, the Y-axis of the graph shows values of "Incidence of Illness" in infants. The varying numbers of infants getting sick with rotavirus represents the
This figure shows graphed medical research results from a study on a new vaccine. The research was done in an effort to determine if a new vaccine would be effective in preventing potentially dangerous rotavirus infections in infants. Green data bars represent occurrence of infant cases that had normal rotavirus strains that aren't critically dangerous. Blue data bars represent occurrence of infant cases that had more dangerous rotavirus strains that can hospitalize or lead
A. normal infant baseline for reference to results from this medical study.
B. control group of infants in this medical study.
C. dependent variable of this medical study.
D. independent variable of this medical study.
E. standardized variable of this medical study.
C. dependent variable of this medical study.
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If an organism has five pairs of chromosomes, how many chromosomal combinations are possible at metaphase I of meiosis?
A. 52 B. 105 C. 510 D. 25 E. None of the answers are correct
Cardiac output can be calculated by
A) measuring the number of heartbeats in one hour. B) monitoring changes in blood pressure for a specific period of time, but for at least 15 minutes. C) multiplying heart rate by stroke volume. D) dividing stroke volume by arterial blood pressure. E) summing heart rate, stroke volume, and blood pressure.
The Earth is actually farther from the sun during the period when the Northern Hemisphere is having summer. How can this be explained?
A. There must be some mistake in measuring the Earth's orbit because if the Earth were farther away, we would be cooler. B. There is a six-month lag phase between sunlight being absorbed and lost. C. The tilt of the Earth presents the Northern Hemisphere in a more perpendicular angle, and this increased sunlight more than offsets the decrease in sunlight due to the added distance. D. The sun grows more powerful on a half-year cycle.
A possible trigger for pneumonia is influenza, which is caused by ________ .
a. a protozoan b. bacteria c. a carcinoma d. a virus e. particulate matter.