Science Introduction to to the Microscope Lab 4

Lab 4 A

Introduction to Microscopes

Mariann Lumsargis

Post-Lab Questions

1. At what magnification do you first notice the ragweed pollen?

-45x

2. Which is bigger, a rhinovirus or E. Coli?

-E. Coli

3. Based on the magnification, how many of the E. Coli can fit into the same space as the head of a pin?

-About 10000 E. Coli

4. About how many red blood cells could fit across the diameter of a human hair (again, look at the magnifi- cation scale)?

- 1000 red blood cells could fit across the diameter for the space of the hair.

Lab 4B

1. After completing the m1 exercise in the “Try this” section, how tall is the letter e?

-145 micrometers

2. What is the highest objective lens you can use to see the entire letter e?

-10x

3. The nuclei (the structure inside a cell that contains DNA) of the cheek cells have been stained using a special dye so that they appear purple. What shape are they?

- Imperfectly Circular

4. At high magnification, you may notice that not all of the nuclei in the onion root tip slide appear as the shape you described in the question above. What do they look like?

Each nuclei is in roughly square or rectangular areas which are presumably made of the cell membrane. these membranes appear somewhat like a spiders web but are together in such a way that they are reminiscent of the kernels on a cob of corn.

5. What is the first step normally taken when you look through the ocular lenses?

-Adjust the oculars