Intro to Cells: T/F

New cells come from previously existing cells. T/F?

All plant cells are green. T/F?

Plant and animal cells contain all the same organelles. T/F?

Mitosis and the cell cycle are identical processes. T/F?

Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. T/F?

All radiation is harmful to us. T/F?

The Microscope

Do we remember how to use it? Always carry the microscope with two hands! Be gentle Rotate the nosepiece to low power, and raise the stage (it should already be in this position) Plug the microscope in and turn it on.

Place your slide on the stage. (cover slip side up) Secure the slide in place with the stage clips.

While looking from the SIDE, turn the COARSE adjustment knob to raise the stage until low power objective ALMOST touches the slide. Look through the eyepiece. Using the coarse adjustment knob, slowly LOWER the stage until the specimen is visible.

Use the fine adjustment knob to sharpen the focus. Adjust the diaphragm if necessary (to increase or decrease the light intensity) , such that the field of view is bright but not glaring.

Switching to Med power While looking from the SIDE, turn the nosepiece from low to medium power. if the objective lens and the slide are going to collide, lower the stage slightly with the coarse adjustment knob Look through the eyepiece. Use the fine adjustment to sharpen the focus. NEVER use the coarse adjustment on medium or high power!

Putting it away When Finished: Lower the stage and place on LOW power Put your CLEANED, DRY slide away Ensure the microscope stage is dry Wrap up the cord properly and put the microscope away

Letter ‘e’ Lab Part II: Magnification Can you find the magnification on the lens of the microscope? Can you find the magnification on each objective? Total Magnification = lens magnification x objective magnification  

What you are looking for in Onion cells… Low/ Med power High power What you are looking to label

What you are looking for in Cheek cells… Low power Med power High power What you are looking to label