To detect immunoglobulin M (IgM) antibodies in an acute phase, blood should be collected in _____ days after the onset of infection
a. 2 to 5
b. 5 to 7
c. 7 to 14
d. longer than 21
C
To help diagnose active disease, two approaches are helpful. The detection of virus-specific IgM in an acute-phase specimen collected at least 7 to 14 days after the onset of infection indicates current or very recent disease. The detection of a fourfold (or equivalent increase if twofold dilu-tions are not tested) antibody titer rise between acute and convalescent sera also indicates current or recent disease.
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A(n) ____ environment is ideal for plant cells, while a(n) ____ environment is best for animal cells
a. isotonic; hypotonic b. hypotonic; isotonic c. hypotonic; hypertonic d. hypertonic; isotonic e. isotonic; isotonic
The ________ of water is caused by the unequal sharing of electrons between oxygen and hydrogen atoms
Fill in the blank with correct word.
The activation of the secondary immune response begins with which of the following?
a. Antibodies b. Killer T-cells c. Memory cells d. Mast cells e. Suppressor T-cells
All of the following are true of chronic fatigue syndrome EXCEPT
A) it may have a genetic component. B) it is also known as myalgic encephalomyelitis. C) it is a psychological disorder. D) it often begins with flu-like symptoms that do not go away. E) it may be triggered by a viral infection.