The ____ is responsible for maintaining the membrane potential across the cell membrane
a. H+ pump
b. Na+/K+ pump
c. diffusion gradient
d. Ca2+ pump
e. osmotic ratio
B
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The dinoflagellate Pfisteria is an important protist. Which of the following statements DOES NOT describe its attributes?
A. It causes nervous disorders in humans. B. It uses toxins to attack fish which it then consumes. C. It lies dormant on the bottom until stimulated by chemicals from fish. D. It is a major cause of food poisoning in humans. E. Its toxins damage fish skin thereby increasing exposure to the pathogen.
Which of the following is NOT a function of the integumentary system?
A. defense against pathogens B. fluid transport C. supporting the weight of body structures D. protection from dehydration E. regulation of body temperature
The causative agent of whooping cough is ________.
A. Bordetella pertussis B. Campylobacter jejuni C. Bartonella henselae D. Ehrlichia chaffeensis
Which of the following encases a nematode body and provides it with support?
a. cuticle b. hemocoel c. spiracle d. chitin