A sick child may have influenza or RSV. These virus infections have different treatment options, so the physician requests antibody titer tests. The results are as follows: anti-influenza antibodies are primarily IgM, and anti-RSV antibodies are all IgA and IgG. Which of the following is the most appropriate interpretation?
A) The child has a current RSV infection and was previously exposed to influenza.
B) The child currently has influenza and has previously been exposed to RSV.
C) The child has concurrent influenza and RSV infections.
D) The child has neither influenza nor RSV.
E) The results do not provide sufficient data to draw a conclusion.
B
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Which one of the following is the most common contaminant of blood cultures?
A) Staphylococcus aureus B) Staphylococcus epidermidis C) Streptococcus pneumoniae D) Streptococcus pyogenes
Judy had plaque buildup in her arteries. When one of these ruptured, a blood clot traveled to
her brain where it blocked blood flow, resulting in death of some of the brain cells. This is an example of __________.
a. a stroke b. atherosclerosis c. coronary heart disease d. a carcinogen
A simple nervous system _____
A) must include chemical senses, mechanoreception, and vision B) includes a minimum of twelve effector neurons C) has information flow in only one direction: away from an integrating center D) includes sensory information, an integrating center, and effectors
Within a chromosomal sequence of a dog, a researcher identifies a block of base pairs with very similar GC content. This observation is likely the result of:
a. horizontal gene transfer. b. replication errors. c. centromeres. d. gene duplication. e. This is unknown.