Which is incorrect about sharks?
A. They have an internal bony skeleton.
B. They have jaws.
C. Most are predators but some are filter feeders.
D. Their eggs are internally fertilized.
E. They belong to the class Chondrichthyes.
Answer: A
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Primary cultivation of most medically relevant organisms and colonial morphologic interpreta-tions are completed at:
a. 6 to 8 hours post inoculation. b. 16 to 18 hours post inoculation. c. 18 to 24 hours post inoculation. d. 16 to 24 hours post inoculation.
An artificial pacemaker supplements the actions of
a. sympathetic nerves. b. the atrioventricular node. c. the medulla oblongata. d. the sinoatrial node. e. the heart muscle itself.
Which of the following is true of the structure
labeled "A"? a. It is composed of tubulin subunits. b. It is composed of actin subunits. c. It is a microfilament. d. It is an intermediate filament. e. It is a major component of muscle cells
Which of the following did not play a role in the eradication of smallpox?
A. Ease of diagnosis by readily recognized clinical features B. A short period of infectivity C. No known reservoir outside of human hosts D. The availability of effective antiviral agents that block replication E. All of these characteristics played a role in the eradication of smallpox