In order for an oxygen molecule to enter the blood from the lungs it must first cross the ____
a. hemoglobin
b. red blood cell membrane
c. capillary endothelium
d. fluid basement membrane
e. pleural membrane
ANSWER: c
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Communal courting areas are called
A. leks. B. mating structures. C. resource areas. D. arenas. E. None of these choices are correct.
Experiments like those first performed by Miller and Urey demonstrated that
a. amino acids and other organic compounds could form in conditions that mimicked the earth's early atmosphere. b. a lipid-protein film will eventually be formed by thermal convection. c. DNA forms readily and reproduces itself. d. complete, functioning prokaryotic cells are formed after approximately three months. e. meteorites contained organic compounds.
The concept that simple organic molecules could form spontaneously from simpler raw materials was
first proposed by: a. Miller and Urey. b. Charles Darwin. c. Thomas Malthus. d. Watson and Crick. e. Oparin and Haldane.
?
Figure 33.6
The accompanying figure shows areas of referred pain that indicate an internal organ is damaged. Which letter corresponds to heart damage?
A. A B. B C. C D. D E. E