Animal research has revealed a general reward system related to the release of the neurotransmitter
A) acetylcholine.
B) GABA.
C) dopamine.
D) epinephrine.
Ans: C) dopamine.
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The three most common glycosaminoglycans (GAGs) are ________, ________, and ________.
Fill in the blank(s) with the appropriate word(s).
An action potential begins when
a. sodium channels open. b. potassium channels open. c. both sodium and potassium channels open. d. sodium channels close. e. both sodium and potassium channels close
Mycoplasmas differ from other bacteria in that they
A) grow inside host cells. B) lack a cell wall. C) are acid-fast. D) are motile. E) are gram-negative.
Which is incorrect about Mycoplasma pneumoniae?
A. It has birds as a reservoir. B. It is a common cause of primary atypical pneumonia. C. Initially causes fever, malaise, sore throat, headache. D. After 2 to 3 weeks, it develops into an unproductive cough and earache. E. Is a bacterial cell without a cell wall.