Which of the following best describes a procedural difference between homogeneous and heterogeneous immunoassays?
A. There is no physical separation of bound from free fractions in a homogeneous immunoassay, whereas in a heterogeneous immunoassay you must separate bound forms from free forms.
B. A homogeneous immunoassay usually takes longer to perform because you must physically separate the bound from free fractions, whereas in a heterogeneous immunoassay the time to perform the assay is shorter because you do not have to separate the bound forms from free forms.
C. There is a physical separation of bound from free fractions in a homogeneous immunoassay.
D. Separation of bound and free fractions is optional for either type of immunoassays.
A
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An allergen is best described as a:
A) substance in the body that recognizes foreign materials. B) chemical released by cells in the body to fight foreign materials. C) chemical messenger in the body that activates the immune system when there is a foreign material present. D) foreign substance that causes a hypersensitivity reaction in the body.
For most personal interactions among friends and many patient encounters, the most comfortable distance between the individuals is:
A) less than 12 inches B) 18 inches to 4 feet C) 4 feet to 12 feet D) more than 12 feet