Controversy surrounds the use of zinc-containing nasal sprays as a cold remedy, since they have been associated with anosmia (loss of smell). If true, this is likely due to the sprays damaging which tissue?
A. osmic nerve
B. sensory systems
C. neuroglial system
D. nervous system
Answer: B
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Which assay is available to identify F. tularensis serologically?
a. Complement fixation b. Direct fluorescent antibody test c. Immunodiffusion assays d. Enzyme-linked immunosorbent assays (ELISAs)
A codon consists of three consecutive
A) DNA bases. B) amino acids. C) tRNA bases. D) mRNA bases.
How many genes does a human X chromosome carry?
a. 100
b. 1,400
c. 2,800
d. 14,000
e. 28,000
How has the avian lung adapted to the metabolic demands of flight?
A) Airflow through the avian lung is bidirectional like in mammals. B) There is more dead space within the avian lung so that oxygen can be stored for future use. C) Countercurrent circulation is present in the avian lung. D) Gas exchange occurs during both inhalation and exhalation.