48. Vaccination is synonomyous with …………..immunity.
a. Natural active
b. Artificial passive
c. Artificial active
d. none
49. When a patient’s immune system becomes reactive to a drug, this is an example of:
a. Super infection
b. Drug resistance
c. Allergy
d. none
50. What is the smallest unit of heredity?
a. Chromosomes
b. Gene
c. Nucleotides
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