Isoniazid belongs to which of the following drug classifications?

When a substance enters the body through the gastrointestinal tract, it has accessed the body by:

A) inhalation. B) surface absorption. C) injection. D) ingestion.

Leptospira spp., Borrelia spp., and Treponema spp. share all of the following characteristics except

A) ability to cause human disease. B) motility. C) possession of a sheath. D) corkscrew shape.