The inhalation of cigarette smoke and similar pollutants has a gradual effect on cilia lining the respiratory tract, first causing the beating to slow and eventually stop. How does this change in cilia most directly impact the resistance mechanisms of the host?
A. Acquired immunity due to antibody response would be lost
B. Innate host immunity due to mechanical barrier protection would be lost
C. Both acquired and nonspecific immunity would be lost
D. Neither acquired nor nonspecific immunity would be lost
Answer: B
You might also like to view...
Iron-oxidizing bacteria grow better in alkaline environments where protons are less likely to abiotically convert Fe2+ into Fe3+
Indicate whether the statement is true or false.
Blood vessels that connect networks of capillary beds are
a. arteries. b. veins. c. portal veins. d. both b and c.
What encourages flooding by allowing water to run off into streams?
A. Acid rain B. Deforestation C. Desertification D. Bioaccumulation E. Biological magnification
Which of the following statements is the best definition of a telomerase?
A. Telomerase is an enzyme that helps solve the "end replication problem." B. Telomerase is an enzyme that helps separate DNA strands. C. Telomerase is an enzyme that cleaves introns and exons. D. Telomerase is an enzyme that helps proofread and correct newly synthesized DNA.