The limit of detection for CLIA is expressed as zeptomoles, equal to which exponent?

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Multiple Choice

The limit of detection for CLIA is expressed as zeptomoles, equal to which exponent?

Explanation:
Zepto- is the SI prefix for 10^-21, so a zeptomole equals 10^-21 moles. Expressing the limit of detection in zeptomoles means detecting about 10^-21 moles, which translates to roughly Avogadro’s number times that amount — about 6×10^2 molecules (a few hundred molecules). The exponent in this unit is -21, which is why zeptomoles correspond to 10^-21. The other options represent much larger quantities (pico: 10^-12, nano: 10^-9, micro: 10^-6) and do not match the definition of a zeptomole.

Zepto- is the SI prefix for 10^-21, so a zeptomole equals 10^-21 moles. Expressing the limit of detection in zeptomoles means detecting about 10^-21 moles, which translates to roughly Avogadro’s number times that amount — about 6×10^2 molecules (a few hundred molecules). The exponent in this unit is -21, which is why zeptomoles correspond to 10^-21. The other options represent much larger quantities (pico: 10^-12, nano: 10^-9, micro: 10^-6) and do not match the definition of a zeptomole.

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