Which of the following is the condition of the skull at birth?
A) The mandible is incomplete.
B) The frontal bone has just begun forming.
C) The floor and roof of the cranium are incomplete.
D) Only the roof of the skull remains incomplete.
E) Only the chondrocranium exists.
D) Only the roof of the skull remains incomplete.
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Olfactory receptors are very special because they
A) lack structural differences. B) can distinguish at least fifty primary smells. C) can distinguish from among thousands of chemical stimuli. D) contains receptor populations with different sensitivities. E) are a rare example of neuronal replacement.
An important buffer in body fluids is
A) NaCl. B) NaOH. C) HCl. D) NaHCO3. E) H2O.
Norepinephrine is a monoamine.
Answer the following statement true (T) or false (F)
A person who is HIV-positive and has a helper T (TH) cell count lower than ________ has AIDS
A) 200 cells/?L B) 1,000 cells/?L C) 20,000 cells/?L D) 50 cells/?L E) 5,000 cells/?L