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What is the correct use of a no-enzyme control?

Answer and explanation

Correct answer: To show uncut DNA pattern

The direct answer is option B: a no-enzyme control shows the pattern of DNA that received no restriction enzyme treatment. A control is an experiment in which one important component is deliberately left out. Here the enzyme is omitted, while the DNA and other conditions are kept as similar as possible. After gel electrophoresis, this lane shows the untreated or uncut DNA pattern. We compare it with the enzyme-treated lane to decide which changes are due to cutting. Option A is wrong because a no-enzyme control is not designed to show enzyme colour; most restriction enzymes are not identified by a visible colour in this test. Option B is correct because it provides the baseline, or original DNA pattern. Option C is wrong because protein concentration needs a separate protein assay, not this DNA control. Option D is irrelevant: the control does not make salt. A useful caution is that untreated DNA can show different conformations, such as supercoiled, nicked, or open circular forms, so its band pattern may not look like one simple linear band. Memory cue: no enzyme means no cutting, so compare it with the cut sample.

Related tags

No Enzyme ControlUncut DnaComparison

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