Discussion
The test(s) used for the assay of cholera toxin is/are
Answer: D
Correct answer: All of the above
All three detect the toxin, and they answer slightly different questions. Radioimmunoassay and ELISA measure it immunologically and are quantitative; the Chinese hamster ovary cell assay detects biological activity, the cells elongating characteristically in response. A biological assay confirms that what has been detected is functional toxin rather than an inactive fragment.
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