What percentage of the US population is Rh negative?
A. 25% of the total population
B. 15% of Caucasians and 5% of African Americans
C. 1.5% of Caucasians and 5% of African Americans
D. 5% of Caucasians and 5% of African Americans
Answer: B
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A neuron is stimulated, which changes membrane potential to the point where voltage-gated Na+ channels open and begin depolarizing the cell. The neuron has reached
A. threshold. B. summation. C. recruitment. D. tetanus.
Cross-cultural studies of human sexual behavior show that:
A. enormous variation in behavior exists across cultures. B. there is virtually no variation in behavior across cultures. C. variation in behavior across cultures can be attributed to differences in biological makeup. D. variation in behavior can be explained by how modern the society is.
When blood oxygen is ________, erythropoietin is released, which ________ production of erythrocytes.
A. high; inhibits B. low; stimulates C. low; inhibits D. high; stimulates
What event precedes the step in the bone-forming process shown in the figure?
formation of a secondary ossification center ossification within a fibrous membrane formation of the epiphyseal plate calcification of the cartilage matrix