When you swallow, the epiglottis covers the opening to the
a. pharynx.
b. esophagus.
c. larynx.
d. bronchus.
e. alveoli.
C
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A PrPc protein can convert a PrPSc to a PrPc.
Answer the following statement true (T) or false (F)
________ is marked by striking motor disturbances, ranging from muscular rigidity to random motor activity.
Fill in the blank(s) with the appropriate word(s).
Why are red algae found in deeper oceanic waters?
A. They are able to utilize the more saline deep water. B. Red algae prefer the warmer deep water. C. Fewer algae predators are found in deeper water. D. They possess pigments that allow them utilize blue-green-light. E. They possess pigments that allow them to utilize red light.
Which term best describes the movement of NH4+ ions into a cell down an electrochemical gradient?
a. a symport b. passive diffusion c. facilitated diffusion d. active transport