________ is essential for preventing blood clotting

A(n) ________ gastrointestinal series is the administration of a barium enema, which outlines the colon and rectum on a radiographic picture

a. upper b. lower c. large d. small

The only catalase-negative, gram-positive rod capable of producing hydrogen sulfide is also

A) gelatinase positive. B) intrinsically vancomycin resistant. C) motile. D) esculin positive.