5. Bacterial endotoxins are
a. proteins in the cell wall.
b. secreted into the environment.
c. components of the gram-positive cell wall.
d. components of the gram-negative cell wall.

6. When a pathogen spreads from the original site to other tissues or organs it is called a(n)
infection.
a. local
b. focal
c. natural
d. acute

7. A disease that is generally present in a given population is
a. pandemic.
b. epidemic.
c. sporadic.
d. endemic.