Discussion
In a classical experiment, a standard is usesd to :
Answer: C
A standard is used to compare and eliminate nonspecific background noise.
In an experiment, a standard or control gives a known reference against which the measured signal is compared. Readings from samples are corrected against it, so that signal arising from the reagents, the instrument or nonspecific binding is removed and only the specific effect remains, as with a blank in spectrophotometry.
A standard is never used to add noise. It gives a relative reference rather than recording an absolute signal, and its purpose is to remove nonspecific error, not merely to record it.
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