During the passage of a nerve impulse,
a. sodium ions pass through gated channels.
b. positive feedback causes more sodium ions
to enter the cell.
c. the interior of the cell becomes positive
relative to the outside.
d. changing voltage increases the number of
open gates.
e. all of these occur.
E
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The hypothesis that closely matches the data provided is:
A. spiders are the top predators on all islands. B. herbivorous insects survive best on islands where spiders and centipedes live. C. herbivorous insects and spider populations are decreased by centipedes. D. herbivorous insects feed on spiders and centipedes.
What is required for the transposition of a retroelement? Select all that apply.
_____ DNA polymerase _____ RNA polymerase _____ Reverse transcriptase _____ Integrase
Which of the following statements regarding helminths causing intestinal distress plus migratory symptoms is incorrect?
A. Praziquantel is the best treatment option for infection with these helminths. B. Nearly all newborn puppies in the U.S. are infected with Toxocara species. C. Tissues along the migratory route of the helminth experience inflammation. D. All of these infections are associated with eosinophilia, which can be detected in a complete blood count.
Which eukaryotic supergroup includes red algae, green algae, and land plants?
a. Archaeplastida b. Excavata c. Rhizaria d. Chromalveolata