Pertussis, or ________, is a bacterial infection of the upper respiratory tract.

What kind of drugs pass readily into cell membranes composed mostly of fatty substances, such as the brain?

A) Water-soluble B) Lipid-soluble C) Bioavailable D) Pediatric

Other than the presence of bacteria, what can contribute to periodontal disease?

A) Caries B) Crevicular fluid C) Absence of plaque D) Nutritional factors