What is combination drug therapy?
A) a succession of drugs to combat an infection–as the infecting microorganism becomes resistant to one drug, the patient is put on another
B) a mixture of drugs and homeopathic medications
C) a mixture of several different kinds of drugs given simultaneously
D) one drug that has a combination of effects
C
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Which one of the following statements about virus classification is not correct?
A. Viruses are classified based on whether their genetic material is double-stranded DNA or RNA. B. Viruses are classified based on whether their genetic material is partially doublestranded or partially single-stranded. C. Viruses are classified based on whether the single-stranded DNA or RNA that serves as their genetic material has a positive or negative sense. D. All of the answer options are correct.
Contrast in microscopy is most commonly achieved by:
a. changing objectives for various specimens. b. increasing the resolution or resolving power. c. staining techniques. d. adding a blue filter to the light path.
What is true of the differences between chemical and electrical synapses?
a. Signals across chemical synapses are sometimes bidirectional. b. Electrical synapses are only found in the brain. c. Neurons are physically connected across electrical synapses. d. Only charged ions can travel across electrical synapses.
Restriction endonucleases are obtained from various species of bacteria.
Answer the following statement true (T) or false (F)