Four of the five flower responses listed below follow
24-hour cycles. Select the exception.
a. solar tracking
b. flowers open in the morning
c. circadian rhythm
d. photoperiodism
e. flowers close at night
Answer: d
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You are taking a lab practical exam. One station has a microscope slide of a cross section through an artery and vein. Which vessel is the artery?
A. the vessel with more muscle tissue and elastic fibers in its wall B. the vessel with valves to prevent backflow C. the vessel lined only with endothelium D. the vessel with a greater overall diameter E. the vessel with the wider lumen (e.g., interior space that contains the blood)
One adaptation to flight in birds is lighter bones, which lack
A. medullary cavities. B. collagen. C. the periosteum. D. bone marrow. E. calcium.
The unique genetic information for each individual is the result of
A. genetic recombination. B. selection. C. mRNA. D. recombinant DNA.
Select the TRUE statement.
a. During ventricular diastole, arterial pressure drops to zero. b. During ventricular systole, the semilunar valves remain closed. c. During atrial systole, the atrioventricular valves are closed. d. The P wave occurs during ventricular diastole.