Assuming resting conditions at sea level, what is the partial pressure of oxygen in pulmonary veins?
A) 160 mm Hg
B) 46 mm Hg
C) 80 mm Hg
D) 40 mm Hg
E) 100 mm Hg
Answer: E) 100 mm Hg
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The primary function served by erythrocytes is
A. transport of oxygen. B. defense against pathogens. C. buffering against changes in blood pH. D. sealing breaks in the walls of blood vessels. E. transport of water-soluble vitamins.
If a population shows little or no evolutionary change for millions of years it is said to be in a state of ________
a. adaptive radiation b. stasis c. extinction d. decline e. evolution
Stanley Miller's experiments were significant because he demonstrated that _____.
A. the behavior of any molecule containing a carbon atom was fundamentally the same B. under certain circumstances the theory of vitalism was valid C. a variety of simple organic compounds could be spontaneously synthesized from components in Earth's primitive atmosphere D. lightning discharges could produce the molecules previously presumed to have originated in volcanic outgassings E. urea could be synthesized from entirely naturally occurring salts
How does crossing-over during meiosis contribute to genetic variation?
A. Each cell created has chromosomes only from a single parent. B. Crossing-over always causes loss of some genetic information. C. Because genes will be in a new order on some chromosomes,additional DNA will need to be made. D. The exchange of genetic material between homologous chromosomes means that a single chromosome now combines genetic information from both parents.