Worldwide, the primary method of transmission of HIV is
A) heterosexual intercourse.
B) homosexual intercourse.
C) intravenous drug use.
D) blood transfusions.
E) nosocomial.
A
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Plasma makes up approximately ____ percent of the total blood volume
a. 10 b. 25 c. 50 d. 75 e. 90
Which of the following excretory tubule segments in mammals consumes the most ATP?
a. distal convoluted tubule b. Bowman's capsule c. descending segment of the loop of Henle d. proximal convoluted tubule e. ascending segment of the loop of Henle
Blood types (A, B, and O) are controlled by
a. sex-linked genes. b. linked genes. c. incompletely dominant genes. d. multiple alleles. e. simple dominance
The scientific method involves each of the following EXCEPT
A. systematic search for information. B. observation and experimentation. C. forming and testing possible solutions. D. formulation of laws and principles that control the observed facts.