Most bony fishes have a hard plate that covers the gills on each side of the head called the
A. pharyngeal slits.
B. radula.
C. gill arches.
D. operculum.
E. lateral lines.
Answer: D
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Which of the following is used to reduce or eliminate the source of an infection?
A. Destruction of an animal reservoir of the infectious agent B. Treatment of sewage to reduce water contamination C. Destruction of vectors by spraying insecticides D. All of the choices are used to reduce or eliminate the source of an infection.
Which of the following is illustrated by the blood-type system in humans?
a. multiple alleles b. codominance c. sex-linked traits d. crossover
LHON is a rare mitochondrial disease caused by weak hypomorphic mutations that affect the mitochondrial electron transport chain. The first symptoms of the disease include blindness. People with LHON are usually homoplasmic because retinas must be homoplasmic mutant for a person to have disease symptoms. Which is true about a male who is heteroplasmic for the mutation that causes LHON? (Select all that apply.)
A) He is likely to develop the disease in other parts of his body. B) He may have children who are blind due to LHON. C) All of his children will most likely be homoplasmic for the wild-type mitochondria. D) Some cells in his body are probably homoplasmic.
Which of the below is not one of the Four types of descriptive studies in epidemiology:
a. ecologic studies b. case reports c. case series d. divisional surveys