During antigen processing in a phagocytic cell, where does the MHC molecule bind antigen?
a. lysosome
b. endoplasmic reticulum
c. golgi bodies
d. cell membrane
e. nucleus
a
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The human voice is generated by air moving through the _____
a. pharynx b. glottis c. epiglottis d. pleura e. trachea
Which of the following direct energy transfers is impossible in living systems?
A) light energy to chemical energy B) chemical energy to kinetic energy C) light energy to potential energy D) heat to light energy
Why is it so difficult to kill acid-fast bacteria?
A) They are just as difficult to kill as Gram-positive bacteria. B) The acid in the bacteria denatures most antibiotics before they can work. C) Mycolic acid makes it very difficult for nutrients and gases to enter or exit cells. D) The bacteria are very motile and can travel to areas with a lower concentration of hazardous chemicals. E) The bacteria are able to quickly break down several types of antibiotics before the concentration can reach dangerous levels.
The thick, soupy liquid of partially digested food that leaves the stomach is called
A. bolus. B. chyme. C. lacteal. D. pepsin. E. lipase.