What is the main purpose of PPE in DNA isolation?

Correct answer: Maintaining sample and worker safety

The direct answer is C: PPE helps maintain both sample safety and worker safety. Personal protective equipment includes items such as gloves, a lab coat, and eye protection, chosen according to the biological and chemical risks of the procedure. The reasoning is: laboratory samples may be contaminated or contain hazardous chemicals; gloves and protective clothing reduce contact with skin and clothing; eye protection helps prevent splashes from reaching the eyes; careful PPE use also reduces the chance that a worker will contaminate the sample. Option C is correct because PPE protects the person and helps maintain cleaner handling of the sample. Option A is wrong because PPE does not increase DNA concentration; concentration depends on extraction and elution conditions. Option B is wrong because PPE does not manufacture ethanol; ethanol is a chemical reagent made by separate industrial or biological processes. Option D is wrong because agar solidification depends on its composition and cooling, not on protective clothing. PPE is only one part of safety: proper technique, labeling, disposal, hand hygiene, and risk assessment are also needed. Memory cue: “PPE protects people and prevents contamination; it does not change the sample’s chemistry.”