During a relative refractory period, ____
a. an axon can transmit impulses comparable to a resting neuron.
b. an axon cannot transmit an action potential.
c. an axon can transmit impulses, but the threshold level is higher.
d. an axon can transmit impulses, but the threshold level is lower.
e. all voltage-activated sodium channels are inactivated.
c
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Being heterozygous for the hemoglobin gene variant that causes the disease sickle-cell anemia can be advantageous in what situation?
A. in areas where malaria is endemic B. when iron intake is too low in the diet C. in elite athletes because it slightly decreases oxygen affinity D. when a person has anemia caused by other factors E. when a person is at high altitude
Gene flow between organisms of ring species occurs
a. between any of the organisms if they are placed in the same environment. b. freely. c. never. d. only between intermediary populations. e. only under laboratory conditions.
Cilia sweep the released mature oocytes from ovaries into the
A. cervix. B. uterine tubes. C. pubic symphysis. D. uterus. E. vagina.
Animals with radial symmetry have neither an anterior end nor a posterior end.
Answer the following statement true (T) or false (F)