The bittern in the above figure is using ____ for protection
a. mimicry
b. display behavior
c. warning coloration
d. chemical defenses
e. camouflage
ANSWER: e
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Glaucoma is a disease of the eye, often caused by an increase in intraocular pressure. This increased intraocular
pressure is most likely caused by ____.
a. loss of lens opacity b. increase in vitreous humor production c. increase in the size of the fovea d. increase in the thickness of the cornea e. contraction of the ciliary muscle
The adaptive immune response differs from the innate response in that
A. B and T lymphocytes can each target multiple proteins, whereas the innate response targets only a single type of antigen. B. the adaptive immune response involves physical barriers and nonspecific processes, whereas the innate immune response relies on the actions of B and T lymphocytes. C. the adaptive immune response targets specific immunogens and remembers them, mounting an even stronger response on subsequent encounters, whereas the innate response is nonspecific and has no memory. D. the innate immune response targets a specific immunogen and remembers it to mount an even stronger response on subsequent encounters with that immunogen, whereas the adaptive response is nonspecific and has no memory.
Which neurotransmitter opens ligand-gated sodium channels?
a. GABA b. cortisol c. ecdysone d. acetylcholine e. brassinosteroid
What characteristic allows veins to prevent the backflow of blood within them?
A. They have a tiny lumen inside them. B. They have thick, muscular walls. C. They are capable of contracting. D. They possess flaplike valves.