An atrioventricular valve prevents the backflow or leakage of blood from __________.
a. the left atrium into the left ventricle
b. the aorta into the left ventricle
c. the right ventricle into the right atrium
d. the pulmonary vein into the right atrium
e. the right atrium into the vena cava
Answer: c. the right ventricle into the right atrium
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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.
The radioactive decay of an isotope can be best
compared to a
a. clock. b. radio. c. mp3 player. d. metronome. e. microwave oven
By focusing on these regions when doing DNA fingerprinting, it is possible to determine whether samples from two individuals have the same number of repeating segments.
A. DNA fragments B. repeating nucleotide sequences C. nucleotide tandem clusters D. chain sequences
Substrate-level phosphorylation transfers phosphate groups directly from ____ to ADP.
A. a substrate B. coenzymes C. the electron transfer chain D. ATP E. the citric acid cycle