Smoking cigarettes causes lung cancer because
A) nicotine destroys the membranes of alveoli, the microscopic air sacs. The alveoli expand, and the person cannot completely exhale.
B) nicotine is deposited as black, sticky tar in respiratory passages.
C) nicotinic receptors in the lungs bind carcinogens in cigarette smoke.
D) nicotine binds the A1 allele of the dopamine D(2) receptor.
C) nicotinic receptors in the lungs bind carcinogens in cigarette smoke.
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In what structure is the sperm of a flowering plant contained?
A) stigma B) carpel C) pollen D) spore
What are the advantages and disadvantages of both sexual and asexual reproduction? What will be an ideal response?
Listeria virulence is directly related to its ability to
A. produce powerful toxins. B. form very resistant endospores. C. live within cells and thus avoid exposure to the immune system of its host. D. move rapidly through the body using multiple flagella. E. resist most antimicrobial agents.
The most prevalent antibody class in the blood is
A. IgD. B. IgM. C. IgA. D. IgG. E. IgE.