Why should the raw gel image be saved in restriction digest results?

Correct answer: To keep transparent and reliable record

The direct answer is A: save the raw gel image to keep a transparent and reliable record. A restriction digest cuts DNA at particular recognition sites, and gel electrophoresis shows the resulting DNA bands. The unedited image preserves the original evidence, including faint bands, extra bands, background, and loading differences. Step by step: the digest is performed, DNA is separated in the gel, the gel is photographed, and the original file is stored before any cropping, brightness change, or contrast adjustment. This allows another person to check whether the conclusion is supported. Option A is correct because raw data supports verification and honest reporting. Option B is wrong because saving an image cannot activate an enzyme; enzyme activity depends on conditions such as temperature, buffer, and time. Option C is wrong because a gel image cannot convert DNA into protein. Option D is irrelevant and scientifically meaningless. A useful exam cue is: raw data must be preserved before processing.