What can a biosafety cabinet be used for?

Correct answer: For contained and cleaner handling

The direct answer is A: a biosafety cabinet can be used for contained and cleaner handling. It is a laboratory enclosure designed to control movement of air and help protect the worker, the sample, or the surroundings, depending on the cabinet class and the approved procedure. The reasoning is: biological work may create droplets or aerosols; controlled airflow and appropriate filters can reduce their spread; careful working inside the cabinet can also reduce contamination of exposed materials. Option A is correct, but the exact protection depends on the cabinet type, risk assessment, and institutional rules. Option B is wrong because DNA sequencing is a separate analytical process performed with sequencing instruments and reagents; a cabinet does not itself sequence DNA. Option C is wrong because agar is a culture medium and the cabinet does not digest it. Option D is wrong because freezing requires a freezer or another validated cooling system, not a biosafety cabinet. A cabinet is not a substitute for personal protective equipment, good technique, or proper waste disposal. Memory cue: “biosafety cabinet controls containment and airflow; it is not a sequencer, freezer, or digestive tool.”