Classroom & Grading
What should you do when you enter the room on an assessment day?
Go to your seat, wait for instructions, and do not touch anything that is out.
Which tool makes precise cuts during a dissection?
Scalpel.
What holds a microscope slide in place?
Stage clips.
Why remove the tip from the substance before letting the plunger return?
Otherwise the pipette can suck the substance back into the tip.
A student using a microscope. They start with the scanning objective, find the specimen, and then switch to high power. The specimen is now blurry.
Did they do something wrong? Why or why not?
yes, they should have used the low-powered objective to find the specimen again before switching the the highest power because otherwise they may struggle to bring the specimen into focus
What is the only thing the syllabus says you need for an assessment?
: A pencil.
Which tool can pin back or indicate parts of a specimen?
Dissection pin/dissection flag.
What do the stage knobs do?
Move the stage/specimen to position the area of interest.
A micropipette shows 20–200 µL. Can you set it to 250 µL?
No.
Your teacher asks you to measure a specific volume of liquid as accurately as possible. You have a beaker, test tube, and graduated cylinder available.
Which tool should you choose, and why?
The graduated cylinder, because it is the appropriate tool among those choices for measuring liquid volume.
If an assessment question does not make sense, what should you do?
Ask for help.
Which tool lets you view objects at the microscopic level?
Compound/light microscope.
What is total magnification with a 10× eyepiece and 40× objective?
400×.
Why must the setting stay within the printed range?
The pipette is designed to operate accurately within that range; outside it can cause incorrect volume and/or improper operation.
Your teacher gives you an unknown science tool and tells you that its purpose is to support equipment above the laboratory table so that other equipment can be positioned underneath it. What tool is it?
A ring stand.
What must happen to your table at the end of a lab?
Clean/disinfect it and leave it free of items and germs.
Which tool supports equipment above the lab table?
Ring stand and base.
Put these in order: high power, scanning, low power.
Scanning → low power → high power.
Put these loading steps in order: release plunger, press first stop, place tip in liquid.
Press first stop → place tip in liquid → slowly release plunger.
Two students are working on a lab. One student finishes early and begins walking around the room to look at what the other groups are doing. The student isn't touching anything, but they are distracting other groups. Is this appropriate lab behavior?
No, students should remain at their station after completing the lab. They may ask to clean up and then return to their station while they wait for others.
What happens to PPE after lab use?
It is sanitized and stored after every use.
Name TWO tools from the presentation used to measure mass/weight.
Electric balance/digital scale, triple beam balance, or spring scale.
Why should a wet mount be prepared carefully to avoid air bubbles?
An air bubble may be mistaken for the specimen.
Put these dispensing steps in order: press second stop, remove tip, allow plunger to return.
ANSWER: Press first stop to begin dispensing → press second stop to empty → remove tip from substance → allow plunger to return.
A student starts viewing a specimen on high power because they want to find the smallest details immediately. They are having trouble locating the specimen and getting it into focus.
What should they do instead?
Start with the scanning Objective and work their way up.