Why a checklist before every lab
A marine biology bench carries real hazards a student must respect. Scalpels cut, preservative fumes irritate lungs, and a mishandled specimen or a spilled test reagent does not forgive inattention. A pre-lab checklist is not bureaucracy — it is the routine that makes safe, prepared work automatic, so that on the day a dissection goes sideways the student's hands already know what to do.
It also does something quieter: it forces the student to arrive ready. The most dangerous lab partner is the one who skimmed the procedure in the hallway. This checklist closes that gap. Print one for every experiment, work top to bottom, and do not pick up a scalpel until the last box is checked.
The goal is not to follow rules. It is to walk to the bench already knowing the hazards, the steps, and the result you expect.
1 — Safety
Nothing below this section happens until everything in it is done. No exceptions, every lab, every time.
- Splash-proof safety goggles on — over the eyes, not pushed up on the forehead.
- Nitrile gloves on, correct size, no holes; sleeves down and long hair tied back.
- Closed-toe shoes and a lab coat or apron; no loose clothing near the bench.
- The handling notes read for every specimen and test reagent in use — hazards, first aid, and disposal noted.
- The room ventilated — a window open — for any work with preserved specimens or fixative that smells.
- Sink, first-aid kit, sharps container, and spill towels located — you know where each one is before you start.
- Waste containers identified — you know exactly where each specimen and leftover reagent goes.
2 — Setup
With safety confirmed, build the bench so the work flows without scrambling mid-dissection.
- The full procedure read end to end — not skimmed — so you know what step comes next.
- All tools and instruments gathered, clean, and dry (unless the procedure calls for it wet) and laid out in order of use.
- Microscope, dissection kit, hydrometer, or graduated cylinder selected to match the task the step requires.
- Microscope focused or water-test kit ready; you know which measurements you need to record and to what precision.
- Specimens and reagents located, labels double-checked against the procedure, and any concentrations confirmed.
- Dissection tray and sharps set up safely on a stable, cut-resistant surface — nothing loose that a blade could catch.
- Lab notebook open to a fresh, dated page with the title and question already written.
3 — Readiness: the pre-lab questions
This is the section that separates a technician from a marine biologist. Before the first measurement, the student should be able to answer these in writing — in the lab notebook, in their own words.
- What is the question? State, in one sentence, what this experiment is trying to find out or measure.
- What is the biology? Write the key structure, relationship, or process the experiment depends on.
- What is my prediction? A specific, concrete expectation — the structures you expect to find, the likely identification, or the trend the data should show.
- What am I measuring, and in what units? Name every quantity you will record, its unit, and its uncertainty.
- What could go wrong? Identify the one or two steps most likely to introduce error, and how you will minimize them.
- What does success look like? Know, before you begin, what a reasonable result would be — so an absurd finding raises a flag at the bench, not a week later.
A student who answers all six is not guessing their way through a recipe — they are running an experiment they understand, with a result they can already roughly predict. That is exactly the readiness the lab-notebook entry is built to capture, and the kind of preparation a lab defense is designed to reward.