Why do Na+ ions enter the cell when voltage-gated Na+ channels are opened in neurons?
A) because the Na+ concentration is much lower outside the cell than it is inside
B) because the Na+ ions are actively transported by the sodium-potassium pump into the cell
C) because the Na+ concentration is much higher outside the cell than it is inside, and the Na+ ions are attracted to the negatively charged interior
D) because the Na+ concentration is much higher outside the cell than it is inside, and the Na+ ions are actively transported by the sodium-potassium pump into the cell
C
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Trichomonas vaginalis is a ________.
A. protozoan B. fungus C. bacterium D. helminth
The pH of a fluid is a measure of:
a. how acidic or basic it is. b. the concentration of phosphate groups. c. the amount of adenosine triphosphate (ATP) in it. d. its capacity to function as a soap. e. its enzymatic stability.
Which one of the following is thought to be responsible for causing dandruff?
a) Malassezia furfur b) Propionibacterium acnes c) Staphylococcus aureus d) Staphylococcus epidermidis
Which form of protist has a complicated parasitic life cycle that nearly always involves the production of infective spores?
What will be an ideal response?