The hormone erythropoietin (EPO) stimulates the production of red blood cells. If there is a stimulation that increases EPO production, what effect would this have on transport of oxygen and carbon dioxide?
A. Oxygen transport would increase; carbon dioxide transport would not be affected much.
B. Oxygen transport would decrease; carbon dioxide transport would not be affected much.
C. Oxygen transport would increase; carbon dioxide transport would decrease.
D. Oxygen transport would decrease; carbon dioxide transport would increase.
E. Oxygen and carbon dioxide transport would both increase.
E. Oxygen and carbon dioxide transport would both increase.
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In Barrow, Alaska, the sun does not set for several months in the summer. Based on what you know about photoperiodism, what type of plant is most likely to flower during the summer in Barrow?
A. Long-day plants. B. Short-day plants. C. Day-neutral plants.
In marine birds, excess salts are removed by:
a. salt glands in the tongue. b. salt glands above the eyes. c. concentrated urine. d. salt glands on the skin. e. salt glands in the mouth.
The active ingredient in Ecstacy works by
a. binding to active transporters in brain neuron membranes. b. blocking the movement of neurotransmitters across synapses c. binding to neuroreceptors on the ends of neurons d. stopping signal transmissions down the length of an axon e. inhibiting the release of neurotransmitters at the synaptic junction
Why do related species share homologous traits?
A. Related species have independently evolved similar traits. B. Related species inherited homologous traits from a common ancestor. C. Homologous traits are the products of divergent evolution. D. Related species have adapted to similar environments.