What would a drug that caused sodium to leak into a neuron do?
A) It would cause the outside of the neuron to become more positive.
B) It would trigger an action potential in the neuron.
C) It would cause the inside of the neuron to become more negative.
D) It would cause potassium to move into the neuron as well.
B
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Freshwater flatworms have a _______ system that is primarily important in osmoregulation, so you would expect the urine in these tubules to have an osmolarity ____ the osmolarity of the body fluids.
A. protonephridial, lower than B. protonephridial, higher than C. metanephridial, lower than D. metanephridial, higher than E. protonephridial, similar to
The figure shows a simplified phylogeny of closely related species of primates. This tree was proposed by comparing DNA sequence changes in the gene for cytochrome oxidase subunit II. The vertical scale represents time and the branch points represent common ancestors. What species did ancestor B give rise to?
A. Siamangs and orangutans.
B. All of the species except orangutans.
C. All of the species except siamangs.
D. All of the species except siamangs and pigmy chimps.
Beginning with the heart, which is the correct order of blood flow, as represented by steps 1-5 in the flow chart below?
a. capillaries, venules, veins, arteries, arterioles b. arterioles, arteries, venules, veins, capillaries c. arteries, arterioles, capillaries, venules, veins d. veins, venules, capillaries, arterioles, arteries e. arteries, veins, arterioles, capillaries, venules
Select the characteristics that is found in all chordates at some time in life.
a. notochord b. postanal tail c. pharyngeal gill slits d. all of these