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When can fluorometric DNA quantification be better than absorbance?

Answer and explanation

Correct answer: When specific double-stranded DNA amount is needed

The direct answer is D: fluorometric quantification is better when the specific amount of double-stranded DNA is needed. Absorbance methods measure light absorption, commonly at 260 nm, but proteins, RNA, phenol, salts, and other contaminants can affect the reading. Fluorometric methods use a dye that binds preferentially to the target nucleic acid, so they are often more specific and sensitive, especially when DNA concentration is low or the sample is impure. Option D is correct because the method is chosen to measure a particular DNA type more selectively. Option A is wrong because burning DNA is not a measurement purpose. Option B is wrong because agar preparation is unrelated to quantification. Option C is wrong because protein digestion is a separate treatment, not the reason for fluorometry. Fluorescence still requires correct standards, dye, instrument settings, and sample handling. Memory cue: absorbance sees general light absorption; fluorescence can identify DNA more specifically.

Related tags

FluorometryDna QuantificationDouble Stranded Dna

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