Attenuated agents
A. may induce immunity after a single dose.
B. may cause disease in immunocompromised individuals.
C. multiply in the body.
D. may revert or mutate to disease-causing strains.
E. All of the choices are correct.
E
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The space between the lens and iris is
(a) the posterior cavity. (b) the posterior chamber. (c) the anterior chamber. (d) none of the above.
Some lichens can reach ages of at least
A. 2 years. B. 10 years. C. 100 years. D. 450 years. E. 4,500 years.
What is the atomic mass number of an atom with 7 electrons, 7 neutrons, and 7 protons?
a. 7 daltons b. 10 daltons c. 14 daltons d. 21 daltons e. 28 daltons
The chemical name for table salt is sodium chloride, or simply NaCl. What type of chemical is NaCl?
A. An element B. A molecule C. An ion D. A compound