Clostridium difficile-associated diarrhea is usually preceded by

A) eating contaminated food.
B) a blood transfusion.
C) extended use of antibiotics.
D) improper food storage.
E) travel to an underdeveloped country.


C

Biology & Microbiology

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Why do many animals do most of their calling at dawn and dusk?

A. Most predators are not active at those time. B. Air is less turbulent and carries sound better. C. Pheromones are also released at dawn and dusk. D. Animals preferentially mate at night. E. Such imprinting behaviors are better received at those time.

Biology & Microbiology

The proteins modified in the rough ER move to the Golgi Apparatus and other organelles through the

A) secretory pathway B) photosynthesis C) nucleus

Biology & Microbiology

Memory cells that form during a primary immune response circulate in the blood for

a. several days. b. weeks. c. months. d. many years. e. a few minutes.

Biology & Microbiology

Proteins that bind to DNA and turn on operons by making it easier for RNA polymerase to bind to a promoter are called

A) regulators. B) operators. C) activators. D) repressors.

Biology & Microbiology