Preparing the body for the "fight-or-flight" response during threatening situations is the role of the ________
A) sympathetic nervous system
B) cerebrum
C) parasympathetic nervous system
D) somatic nervous system
E) afferent nervous system
A
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Which of the following meninges is the layer closest to the brain and spinal cord?
A. Pia mater B. Dura mater C. Arachnoid mater D. None of the answers are correct
The spleen and thymus are part of the
A. cardiovascular system. B. respiratory system. C. lymphatic and immune systems. D. digestive system.
The protein miraculin, which is found in taste-altering "miracle berries", causes acidic foods like citrus fruits, soda, and vinegar to taste like candy. Which of the following is the most likely mechanism for the effects of miraculin?
A. Miraculin amplifies umami receptors, enhancing umami flavors. B. Miraculin alters sweet receptors on the tongue and causes them to perceive carbohydrates as sour. C. Miraculin inactivates sweet receptors, so only sour receptors will detect sweet compounds. D. Miraculin alters sour receptors on the tongue and causes them to perceive acids as sweet.
A receptor that binds to a ligand at very low concentrations has a
A) High dissociation constant. B) Low Ka. C) High affinity for the ligand. D) Low affinity for the ligand.