EXERCISES, LESSON 4
INSTRUCTIONS: Answer the following exercises by marking the lettered response that
best answers the exercise, by completing the incomplete statement, or by writing the
answer in the space provided at the end of the exercise.
After you have completed all the exercises, turn to "Solutions to Exercises" at the
end of the lesson and check your answers. For each exercise answered incorrectly,
reread the material referenced with the solution.
a. Bacteria, viruses, pneumococci, and toxins.
b. Toxins, rickettsia, viruses, and bacteria.
Viruses, bacteria, hepatitis, and toxins.
d. Smallpox, malaria, bacteria, and dysentery.
Submicroscopic pathogens composed of nucleic acid that invade living cells, and
take over the cell's reproductive functions are called:
The origin and ability of __________ to affect the human immune system
separate them from other poisons.